Heads up, according to a friend of mine who just came back from Burning Man in Nevada, many, many bikes were left abandoned after the event.

According to the event's webpage:

Love ‘Em… and Please Don’t Leave ‘Em
Leave no trace. A bike is a BIG trace. Somehow it’s become a common myth (playa legend, perhaps?) that it’s perfectly acceptable to leave your bike behind upon striking your camp. Nothing could be further from the truth. If you pack it in, pack it out!

However, apparently, it is perfectly acceptable to leave bikes behind, so there may still be lot's of bikes for bike projects in the region of Black Rock, Nevada to gather up.  Something definitely to look into if it hasn't already been.