Sometimes if you look for a hotel on the website, on the search results page, it is supposed to show you the lowest available rate for that hotel but sometimes, you click on the hotel and that rate is not available. For example:

try san franscisco, 4/2-4/3 and look at the Palace Hotel. It comes up $329 but when you click on it, there is no room for less than $369. What is the deal with this? I have seen this happen quite a bit. I assume that they probably store the values that appears on the seach results page separately and do not update them enough, though it should work properly.