[discuss] WTS $737 store credit how would I go about it?

Not played SC in a few years, and I recently ran into money trouble, so I tried to sell my account to the Impound. They only offered $220 and said they had no ETA on when they could actually buy the account. After looking for more options, I saw that selling store credit was Easier. Is there a standard way of selling credit? And how would I go about it?