I just had two of my clients find great deals on TRX systems at bonanza.com (search for TRX suspension trainer). Also, if you go to both Groupon and Living Social, sometimes you can find older deals that remain active. I bought my TRX from Groupon a few years ago. You do need to search around, though, because even though it’s TRX, I’ve noticed the models can be slightly different.
TRX is worth the investment. Good luck!