What about looking at Walmart? Or garage sales?

I just had my still growing son in Walmart looking at bikes and there were some clearanced between $50-75.

Ya, I know, it's Wally World. But if you are riding it 6mi round trip to a college campus (theft rate you already know) it's not such a bad thing.

Some of our lbs also take in used bikes as trades. I've seen some lovely bikes that I really wanted to bring home with me if I could.

Good Luck!