No way! You can easily find new bindings. I almost bought some Salomon 711's to keep for another set of skis for like $50. I would expect they're on ebay for close to that.
Also, I would watch www.steepandcheap.com
for something popping up - they haven't had ski bindings in a while...www.geardirect.com
is good or you can call Colorado Ski and Golf and they'll help you out - I'm sure they'd love to get of some lower end Salomons.
The C series (esp. the 509) is a good binding for the price but there's lots of plastic involved and a friend of mine is having retention problems. Personally, I wouldn't go lowest-end ever if you can avoid it...