There are the JBL Cinema Sound Series CS400SAT for $125 a pair. I haven't listened to them, so I can't say much about them. JBL also makes a complete 5.1 system, the CS6100BG, you can get for $600 ($1200 list). But I can't help you out whether or not it would be worth it. $600 ain't gonna get much.

Check the Paradigm and Polk Audio websites.