I get to get my kicks riding the worksman bikes at my office. they weigh 50 lbs or so, there's one gear and coaster brakes. The saddles are awful, but when you only ride 1/2 mile at a time, who cares. it's fun to pedal as fast as I can on that kind of bike and then squeeze my ball trumpet horn for effect.

do you have a bike auction at your local police station?
also, check garage sales!

(there are great bikes hiding everywhere. ... like Craig's List!)