My trainer is more than you want to spend, although you could try ebay... I have a Kurt Kinetic. It gets a good amount of use.

http://spinervals.com/

Spinervals are the brainchild of the Evil Coach Troy. It's kind of like spin class, but way harder than any class I ever took. Essentially you have this very cruel man telling you what gear to be in and what your cadence should be...no not my husband. And he makes you stay there for a wicked long time!

V.