best shops for a cheaper maybe used bicycle?

looking for a shop that sells used bikes that maybe i can pick up for less than $100. Ive been riding a mountain bike the last few summers and wanted a change like a faster/easier cruising bike. 10 speed maybe? Im not sure where to start and dont want to get ripped off since i know nothing other than i like riding in the summer. if anyone knows of anything or puts in their two cents…greatly appreciated. I figured id wait for garage sales but its hard to come across something decent you know.

craigslist.com

you will get a better bike without a shops markup

get a used roadbike

for a cheap 10spd your best bet is prob to hit up all the goodwill/salvation army locations in the area and find one thats in half way decent shape.

Ricks downtown sells a lot of road bikes for cheap. He has a full basement with used bikes.

+1 for ricks. Ton of bikes. Ask for superman