B) Do not attempt to sell, or pay with items or ToriCredits that are not in the inventory of the account that is posting. This also covers the sale of items currently in the market.
Your current balance is 600tc. No one is going to sell you full 512 textures for that amount. Feel free to either reopen this thread or make a new one once you gather more tc
Are you an artist and want to make a decent amount of TC? Check out this thread.