Here's one to try: Kayak.com they actually own sidestep.com having acquired them in 2007 It's one of those sites that pulls in data from over 400 travel providers to find you the best deal. It includes Sidestep, Skoosh, Gtahotels, Expedia, Orbitz and hundreds more. I checked for a random week in November and the best price came out at $115 per night and that was per couple not per person. I have emailed them to see if they can provide a link direct to their Temptation page but for now you have to filter your way down, they also do flights too.
For fun I checked out the hotel price on skoosh and it has a good price for just the room but by the time I added airfare it was much more than what we paid for the room + flights using Orbitz with a coupon code of ENTERTAIN200 ($200 off a 7 night Mexico stay)