go to any auto prts site...advance...auto zone..my fave rockauto.com and price both o2 dendsors...when you see the low prices and realise it takes 15 to 20 min to replace them you will see your right about the rip off...try and ask friends..co workers .who runs a good non dealer shop....try asking a used auto sales place...they often have a place that works flat rate on any make..