Depends on the size and weight of the package, but it should be around $3 or so (at least that's what other people have told me when I asked them about shipping various things). You'd have to check with your local post office regarding how much it would be for sure, though.
The local PO here told me that if you have any games, books or movies you can send it @ a discounted "Media" rate...maybe that will help and save you a few bucks!!! Totally watching this auction too! You have great stuff!