I just booked today at $140 each way for my August trip. I've been watching it since February and it still hasn't gone down. In fact, back in February most all of the flights were $140 each way and now its down to only one or two a day. In playing around with the dates in the last two weeks there are some dates that aren't even offering the $140 flights.
If your dates are set in stone (mine weren't) or if you're going during the holidays, I would book now. If not, you could continue to watch them. With gas starting to go down, they might drop some.