You're gonna be hard pressed to find anything new under $100 that's actually worth putting on your skis. Talk to some friends and keep an eye out for some used bindings. Salomon racing stock is always good and relatively bulletproof.
Best bet though: save up awhile longer and get new bindings so that you get a warranty.
If you're a skinny mofo you can probably get away with s810 or P10's for under $100. If you're a fat kid then forget it and save up for s912's or P12's.
I have s810's and dont really like them that much, the toe piece wings loosen up all time. However, I have never pre-released and they always release when I need them to.
If you didn't notice yet, all the cheapest bindings being mention are Salomon. (hmm, wonder why...) Just save up a few extra bucks and buy last years bindings. On D-Structure's website you can get last years Looks for around 200 CND and I think skiershop.com has similar prices.
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LIL jons music about punk ass bitches that need to get out of the club is a metaphor for something deeper inside of us - atlantaski
to late, i had to buy my bindings on the spot, since i got fucked with my used skis, anyways they seem to be doing the job well, i dont see whats wrong with them, and i dont do 50footer gaps so....
Last season i got Look Nova 11's for $89 on some good website, i forget which one though. They have held up well, DIN goes up to 11 and are a great binding for the price i got them for