Sorry guys, I'm abroad toady and this is the only moment I can read the forum.
Valerio was just saying that the kit he made for mounting the GoPro on the bike has a cost of 40 euro (more or less 50 USD) and that shipment cost is even higher, in the range of 48 euro, so the final price for you American guys is quite high
There should even be some import taxes you should pay to UPS or FedEx...
Selling things privately in the US it's a PITA!
Ugo