I just found one of these CO-OP's near me, but need to make some time to visit. Friend of mine went to one and said he loved it. He bought a used single speed off craigslist and they helped him "tune it up". He dontated a some cash and his time to help others. Sounded really cool. I am sure others with more experience could weigh on their thoughts.

http://www.bikecollectives.org/wiki/..._Organizations