Get on EBAY and look for used cATS...
Hightower found me a set on EBAY for the front and rear...
I got the front $40 bucks...The rear, $10 bucks...This includes three O2 sensors, and supposedly the SVT that it came off of had only 55K on the odometer, so they should be good for a long time...
Guess where they are? On my shelf...After I bought them, my CEL went off

And, no, I won't sell them, because as soon as I do, that's when the CEL comes back on

Anyway, check on EBAY for some, you never know...