A cheap price from Newark, New Jersey to McAllen, Texas in airfare? (Please Read Description)?

I need to get here on the 2/20/11 and return on 2/27/11. I tried looking on many websites as possible, but I need a very cheap price. I prefer nonstop, but flights like that don't exist going here. If possible, please name the price going here (roundtrip) from Newark, New Jersey to McAllen, Texas. Also, please name how you found this price. (Ex. website/travel agent)