Garage sales this summer, or school auction/sales beginning in the Fall. They will sell off all of the bikes that are left behind in the Spring. Bring along a friend who knows something about bikes. Find one that fits and functions and is cheap. Get a good lock. Replace the tires and tubes as necessary and tune the brakes/shifters to the best you can. Don't spend a lot of money. The bike will be a rust bucket in four years anyway...

I have one daughter in college in Waco and one that just graduated last Spring. Seems that bikes are generally single speeds or older mountain bikes. Nothing fancy - this isn't a fashion show. You want the bike to get you to class and maybe a weekend errand or so. You want it to work and not get jacked by the shady types that seem be everywhere in Austin (was there a few weeks ago) once you get off campus.

Good luck.