Ha ha....well, I called my mech. He said 450 for both Pre cats.
OR...I went to Autozone.com, which has them for 72 bucks a pop. $150 for 2......hmmm......tough choice.
By the way....since I was looking at sensors on Ebay, is there any way I can buy the wrong one. Cause based off of Autozone....it's just either Pre Cat sensors, you need two of the same. OR Post cats, which I'm not going right now.....Pre or Post is the only difference, right?