Hi!

Can you build a wheel?

If so, I think this is a tough price to beat (roughly €20 or so):

http://www.amazon.de/Shimano-Fahrrad...ds=nabendynamo

I would also look through here and find one person that will ship to the US (rough €50 or so):

http://www.amazon.de/s/ref=sr_st_sca...964de966e6db4d

That should get you started with the hub dynamo!