I found this on another site, I hope this helps. http://pub210.ezboard.com/bpricelineandexpediabidding
I've used them with mixed success. Minneapolis was fine (Doubletree by the Mall of America for $35/night). Sioux City was eh. (Sioux City Plaza Hotel for $31/night). To be fair, the Sioux City hotel was fine, too, but I was frustrated by the driving directions and the "friendliness" of the counter-person at check-in.
I absolutely love Priceline for hotels. My hubby and I use it almost exclusively (haven't called a hotel for a reservation in years). A website that has been very helpful to us . . . www.biddingfortravel.com