Cheap O2 sensor source?

[casm]

Sorry for throwing this here rather than off-topic, but I need a local source for cheap Bosch O2 sensors. My car failed smog; the cat has been replaced (the old one contained nothing but air and soot), but in case I end up needing an O2 sensor I'd sure like to find one cheap locally since I've got the 4-wire type. FWIW, it's a Bosch 13078, and my meter claimed that it's still working - but, just in case... Any suggestions?

 

[ryurabbit]

Year? Which one? Cali vehicle? How about the last 9 of the Vin#? I can get you a factory one but I need some info to proceed.

 

[casm]

Year? Which one? Cali vehicle? How about the last 9 of the Vin#? I can get you a factory one but I need some info to proceed.

Actually, it's OK. Looks like the problem was a dead catalytic converter - literally, there was nothing but soot and air inside. Replaced it and passed the retest with flying colours. Thanks for the offer, though.

 

[ryurabbit]

No problem, let me know if you need anything else