Read CEL code to know that I need the down stream O2 sensor for my 98 OBW with 95, 2.2 motor. I have started shopping on line for a good price. So far Advance Auto Parts has a Denso OEM  part # 234-3088 for $92. W/ discount, I can get the price down to $64 w/store pick up. Anyone know where I can do better?

Rockauto.com under 95 legacy 2.2 denso same part number with a discount code from retailmenot.com 5% off 53.29 with shipping, shipping is set to my location and its $3.14 it might be more for you.

Rockauto.com under 95 legacy 2.2 denso same part number with a discount code from retailmenot.com 5% off 53.29 with shipping, shipping is set to my location and its $3.14 it might be more for you.

Thanks for doing the research and sending the info. I found a 40% coupon code for Advance Auto, so added a couple of oil filters to go over the needed $100 purchase to activate the coupon. With this coupon, Advance's price is comparable to Rockauto, while being only a 5 minute drive from home for store pick up. Thanks again!!

I'll just add this since my experience is recent:  

Just a couple of data points to toss in for those suffering the
occasional PO420 CEL.  My car is a 2001 Forest with 120k miles on
her....yes, she is a Lesbaru.

My CEL PO420 has been coming on
about thrice per year lately.  I plug in my CEL Scanner and erase the
code and drive on my merry way.  Since we do limited, mostly city
driving, it can take a while for Emissions Test Ready reset cycle to
complete.....so you can pass inspection.  This month, it took about 189
miles and nearly 3 weeks of driving to get the pending PO420 to turn off
and the Emissions Ready Green Light to appear in my CEL Code Scanner. 
Then it passed inspection no problem.