So, i'm doing some trolling for oxygen sensors online today and I run into this website.. sparkplugs.com . Immediately I'm thinking to myself..i put in a search for o2 sensors and I get this...alright I'll play...so it turns out these guys have NGK oxygens sensors as low as $50. That's gotta be lowest price around. Has anyone seen any cheaper ones? (By the way, isnt NGK the stuff Nissan uses?) Even with ebay. the lowest I could find was about $60....