god...
get a road bike.
check garage sales.
old schwinns do the trick
and there are lots of them.
look for one that has a "schwinn-chicago"
sticker just under the seat. those are tight.
things are tanks, prolly wont get stolen
and can be found for like $50.
edit: look for varsity, collegiate, and continental models.
and if you dont mind a girls frame then you will definitely
not have a problem tripping over one at a garage sale.