Anybody know where to buy 'em CHEEP?

Several online dealers sell OEM parts at about 30% off the MSRP (list) price. After discount, knock sensors seem to average about $70 plus S/H; a used one might be "CHEEP", but with that part you could easily get what you pay for.

autozone $44

autozone looks like a good price but they quoted me $89.00 for one

autozone looks like a good price but they quoted me $89.00 for one

My 1963 CORVAIR never had a knock sensor, and ran for years cheaply. These are "designed in" expenses the buyer isnt aware of until after the purchase.:-\

My 1963 CORVAIR never had a knock sensor, and ran for years cheaply. These are "designed in" expenses the buyer isnt aware of until after the purchase.:-\

1963 was many years before the Clean Air Act, the Arab Oil Embargo, CAFE standards, etc, etc, etc. Automakers are fighting an ongoing battle to build vehicles that meet increasingly stringent US safety, mileage, and emissions requirements and still perform reasonably well. As a result, cost and complexity are constantly increasing.