Once you bid you can't just take your credits back. Unfortunately the winner is going to have their credits tied up for days. It will only cost like $2.00 to ship this just so you know.
You CAN remove an auction rather than sitting here telling people not to bid on it. It doesn't work that way, you post an auction saying that its free shipping that exactly what it should be. And like Purplelady08 said, it's only like $2.00, if the buyer really wanted it they would pay the shipping fee. Just saying.