Gents,
You may want to consider some of the products made by "Woss Enterprises" as a more reasonably priced alternative to TRX. You won't get the cute bag and training DVDs, but I suspect that won't matter at damn near 1/4 of the price.
I've used the WOSS SST Suspension Trainer to good effect for the last month as part of a class (however I have no experience with the brand name TRX system).
Link refers:
http://www.wossent.com/strap-suspension-trainer/