BKKLEE is correct...if the rate is an obvious error MI HQ will stand behind a hotel in not honoring the rate ($1 for a room I believe would fit the legal def of an obvious error while $31 might not)...but with that said in all the times that I've had this occur I've always honored it and will most likely continue to do so (as have most of my Colleagues) but I will remind you of the Interstate Hotels run Residence Inn Time Square...do a search and you'll find a really long thread about a rate error there, or the many threads in the Starwood forums, or heck even the Hyatt Andaz mess of this past December....to me these are just another good reason to honor rate errors (also one of the reasons NWA always honored fare mistakes but not all airlines do so)