It's become very hard to find cheap fares NYC-LAS. I don't think the $200 RT exists anymore, and at this point I'm pretty happy if I can find a fare in the $250-300 range. On the weekends (out Fri, back Sun) under $300 is very difficult to find. Even JetBlue's baseline fare (which is also almost impossible to find on weekends) seems to be up to $179 one-way. It sucks, but the airlines have been successful in getting the price up.