the smallest GIN is 2000. just edit your auction before any bids. go to "show advanced options". Click on "Allow users to instantly win my auction for a set credit amount" and enter the amount you want. There will be a listing fee and Listia will take a cut of the bid, but you have to be a trusted seller here to use GIN
I'd give yo 3500 credits if you pay the shipping. You can set up an auction that starts higher, but I don't know if beginers can do that. Things have changed since I started here.