THIS IS THE CASH SHOP ITEM GUIDE. THE LIST BELOW HAS A DESCRIPTION OF EVERY ITEM IN THE CASH SHOP.
Please let me know if any information is incorrect or outdated.
Quicklinks:
Mount Related Items
Pet Related Items
Upgrading Stones
Books
Consumables
Buffs
Bags
Miscellaneous
First, a bit of information about items. You will often times see the same items multiple times in the cash shop. This is because you can buy these items in different quantities, time duration, etc.
Binds: Cannot trade to other players but can be sold to a vendor.
No-Sale: Cannot sell to a vendor but can be traded to players.
Okay, now onto the guide!
Mount Related Items:

Description: Player mount.
Speed increase is 14. Colors vary.
Auction House Value: N/A

Description: Mount Fuel.
Using this increases mount speed by 50%
Auction House Value: N/A
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Pet Related Items:

Description: Ring that can be equipped to a pet.
This allows you to buy items from the general shop anytime, anywhere.
Auction House Value: N/A

Description: Ring that can be equipped to a pet.
This allows you to sell items from your inventory anytime, anywhere.
Auction House Value: N/A

Description: Ring that can be equipped to a pet.
This allows you to access the auction house anytime, anywhere.
Auction House Value: N/A

Description: Ring that can be equipped to a pet.
Allows mailbox access as well as sending and receiving items through mail in this way.
Auction House Value: N/A

Description: Ring that can be equipped to a pet.
Using this ring allows you to turn a piece of equipment into crafting materials.
Auction House Value: N/A

Description: Ring that can be equipped to a pet.
Using this ring will generate a random item to a separate bag. This bag can be accessed by clicking the ring in the pet tab. Does not generate Dragonballs.
Auction House Value: N/A

Description: Ring that can be equipped to a pet.
Having this ring equipped will increase quest item drop chance by 30%.
Auction House Value: N/A

Description: Using this capsule will give you a random cash pet. I believe the only cash pets are the blue and red Puars.
Auction House Value: Puars can range anywhere from 5M - 12M
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Upgrading Stones:

Description: Stone used to upgrade equipment.
This stone has a chance to upgrade equipment anywhere from +1 to +3.
Auction House Value: 2.5M - 2.7M each

Description: Stone used to downgrade a piece of equipment.
Using this will downgrade an item by 1.
Auction House Value: 350k each

Description: Used as an item upgrading helper (I don't know what else to call it).
If item fails to upgrade, this stone will prevent the item from being destroyed. This will NOT prevent your item from being downgraded.
Auction House Value: N/A

Description: Used as an item upgrading helper.
If your item fails to upgrade, this will prevent the item from being destroyed. This item will also prevent your item from falling below +6.
Auction House Value: N/A

Description: This item is a capsule with a random type of upgrade stone(s) in it. By buying this item, you are taking a gamble on the stone(s) you receive.
Auction House Value: N/A
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Books:

Description: Allows you to change your character's name.
Auction House Value: N/A

Description: Allows a guild leader to change the guild name.
Auction House Value: N/A

Description: Resets all of your SP points.
You keep skills that don't use SP points like: SSJ, Master Class, HTB attacks, or any of the skills you learned from going into the time portals lvl 1-20.
Auction House Value: 10M - 13M

Description: Allows you to refund SP points in whatever skill you want.
Example: You put one or two points into the wrong skill. Buying this book will save you a lot of money instead of buying a full reset book.
Auction House Value: N/A

Description: +20% exp from killing creatures only. Only usable from lvl 1-30 inclusive.
Auction House Value: 200k - 500k for 7 days

Description: +30% exp from killing creatures only. Only usable from lvl 31-54 inclusive.
Auction House Value: 400k - 1.2M for 7 days
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Consumables:

Description: Consumable item.
Instantly restores 1140 LP. Shares cooldown with other potions.
Auction House Value: 5k each

Description: Consumable item.
Instantly restores 1650 LP. Shares cooldown with other potions.
Auction House Value: 20k each

Description: Consumable item.
Instantly restores 1368 EP. Shares cooldown with other potions.
Auction House Value: 4k each

Description: Consumable item.
Instantly restores 2025 EP. Shares cooldown with other potions.
Auction House Value: 10k - 15k each

Description: Consumable item.
Restores 256 LP every 2 seconds for 12 seconds. Shares cooldown with other foods.
Auction House Value: 6k - 7k each

Description: Consumable item.
Restores 307 EP every 2 seconds for 12 seconds. Shares cooldown with other drinks.
Auction House Value: 5k - 6k each

Description: Consumable item.
Cures poison.
Auction House Value: 12k - 16k each

Description: Consumable item.
Cures abdominal pain.
Auction House Value: Almost worthless. 500 - 2k each

Description: Consumable item.
Adds 1 full bar of RP.
Auction House Value: 5k each

Description: Consumable item.
Adds 2 full bars of RP.
Auction House Value: 10k each
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Buffs:

Description: Consumable item.
Increases strength by 25% for 10 minutes.
Auction House Value: 36k each

Description: Consumable item.
Increases constitution by 15% for 10 minutes.
Auction House Value: 30k each

Description: Consumable item.
Increases energy by 15% for 10 minutes.
Auction House Value: 4k - 5k each

Description: Consumable item.
Increases soul by 25% for 10 minutes.
Auction House Value: 6k each

Description: Consumable item.
Increase speed by 20% for 10 minutes.
Auction House Value: 5k - 15k each
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Bags:

Description: 28 slot bag.
Auction House Value: N/A

Description: 32 slot bag!
Auction House Value: N/A
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Miscellaneous:

Description: This item gives you an extra 16 slots in your bank for a limited time period.
Auction House Value: N/A

Description: From what I understand, this item allows you to save any location and teleport back to it.
Example: You could save a location in the middle of nowhere and teleport back to that spot if you need to.
Auction House Value: N/A

Description: Using this item allows you to change the time you receive the exp and zeni boosts.
Auction House Value: N/A

Description: Token used to play the wagu wagu machines.
Auction House Value: N/A
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I will do my best to keep this updated.
THANKS EVERYONE!
Special thanks to the following people for helping me with incorrect/missing information:
ishali
Citrinate
PanJa