I expect that the utility of this drops as more people use it - if a bunch of people get a notification about a cheap flight, and there are only two seats at that price, most people are going to be unhappy.
Flight prices change really fast so its possible the flight price actually changed in the time they checked for the deal and the time you clicked through
saw the same thing
Re:Hipmunk Launches Flight Deals
by brianbreslin on Thursday January 17, 2013 @04:20PM
(#5075292)
so you're suggesting a HN meetup in vegas? :-)
Edit: I tried again with different dates and was able to find a flight for $88. So guess it just needs some fine tuning.