I've sold my BFL pre-order for $3000 + $199 shipping fees.
First PayPal charged me $125 fees for receiving payment then eBay charged me $255 selling fees. I will never sell anything on eBay again.
Here is a calculator that will help you determine all the fees. Usually, its 12-15% of your overall selling price that ebay & paypal gets.
http://www.newlifeauctions.com/calc.html