Don't know if this helps, but I was able to find the best rate for my trip through www.hotwire.com.
Flying major US carrier out of Miami. If you can be flexible about your departure and arrival time, as you don't get those until you pay, it seems the way to go. I've used them before and all went smoothly with an e-ticket. I checked flycheapol.com, too, but they didn't have flights when I wished to depart and this turned out to be less expensive, afterall. Have a great trip!