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I bought mine from ******************************************************************************************** free shipping too. There was a thread on here a while back that suggested using cheap non-bosch o2 sensors. The model number for the cheap o2 sensors is USOS-4000. Those apparently work on egas Boxsters (year 2000 model year and later), but they do not seem to work on non egas Boxster (model year 1997-1999, cable operated throttles). I confirmed that they didn't work for me on my 1999. I ended up buying Bosch ones part number C5010-126055, I had to splice them and they worked on my car, no problems. You can also get Bosch OEM connector ones, but they are more expensive. I'd personally go with Bosch ones if you can - the one's Grizzly mentions are not Bosch, but are cheaper.
A quick note about o2 sensor replacement. Lots of people think the life of an o2 sensor is only 30k miles. That is not completely true:
"Unheated 1 or 2 wire wire O2 sensors on 1976 through early 1990s vehicles can be replaced every 30,000 to 50,000 miles. Heated 3 and 4-wire O2 sensors on mid-1980s through mid-1990s applications can be changed every 60,000 miles. On OBD II equipped vehicles (1996 & up), a replacement interval of 100,000 miles can be recommended."
My recommendation to you is to replace yours only if you get a check engine light or as you get closer to 100k miles. You can of course replace it sooner with no ill effects and it might help your car run smoother depending on the condition of the current ones.
Good Luck,
Larez2
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