Advance auto has them at 74.99, use coupon code "TRT30" and get them for 52.99.

 

I just checked Amazon, $50 and change for the front, $52 for the rear, free shipping.

 

I had them in my Amazon cart, then checked Advance, and they were in stock at local store, so I put it off. Then found a full set(downstream and upstream) on Ebay for 120.00 shipped. So I went ahead and purchased them. The seller had purchased them, then sold his Disco. They came in brand new in original boxes. I was not getting any codes, but when I watched the data stream of the O2 sensors, they were not cycling like I read they should be. They would hang on rich for 5+ minutes or longer, and sometime they would read 0.0 volts for a long time. I changed them yesterday and now they are cycling up and down, and the truck idles smooth, accelerates smooth.

 

So far as I can tell, Advance Auto has no idea that there are places that are not in the US of A. I don't believe it has occurred to them as to be a possibility and honestly think it would come to them a surprise if they were to find out.