Prices vary depending on equip duration, how long a player wants to hold onto an item:
Pirate Eyepatch
30 days | ~2€ | gives 14 T-cat coins | gets destroyed after 30 days
365 days | ~3€ | gives 24 T-cat coins | does not get destroyed even after 365 days
Black Glasses
30 days | ~2€ | gives 22 T-cat coins | gets destroyed after 30 days
365 days | ~3€ | gives 30 T-cat coins | does not get destroyed even after 365 days
Sapphire Blue Glasses
30 days | ~2€ | gives 22 T-cat coins | gets destroyed after 30 days
365 days | ~3€ | gives 30 T-cat coins | does not get destroyed even after 365 days
Ruby Red Glasses
30 days | ~2€ | gives 22 T-cat coins | gets destroyed after 30 days
365 days | ~3€ | gives 30 T-cat coins | does not get destroyed even after 365 days
Emerald Green Glasses
30 days | ~2€ | gives 22 T-cat coins | gets destroyed after 30 days
365 days | ~3€ | gives 30 T-cat coins | does not get destroyed even after 365 days
Glasses Collection (all four glasses in a pkg)
30 days | ~6€ | gives 96 T-cat coins | gets destroyed after 30 days
365 days | ~9€ | gives 134 T-cat coins | does not get destroyed even after 365 days
Nightmare Horse
365 days | ~16€ | gives 304 T-cat coins | does not get destroyed even after 365 days
As of now you can't buy anything other than besides vanity stuff. However for every purchase you do, you get T-cat coins which are used to buy non-cosmetic stuff such as:
12H Playtime Crystal Protection!(40 Coins) No more losing crystals, no matter how often you die. Sounds awesome for trying Hardmodes and gives you a huge advantage over others!
Special Sealing Scrolls (I think 10 Coins, will check when im back from work) that are needed for the luxing proccess, these Scrolls would normally cost you 200newGold (2Million Old gold). They can else only be aquired in Dungeons and with the presents you get with the Cross-Server-Dungeontool.