Not really cheap or quick but ...
1. 20" BMX bike
2. 20" Stingray 5 speed wheel
http://compare.ebay.com/like/1605948...=sbar&_lwgsi=y
3. Derailleur with claw, cable guides and shift lever
I bought my at the time 7-year-old the nickel-plated Mongoose I wanted as a kid.
