How much should a mass air flow sensor cost me?

msrp for oem maf is around 285.00. One thing that needs to be remembered is the repair facility provided you an oem part, not some off brand aftermarket part. Secondly is that part and labor came with a warranty. If that part fails, that shop is now doing that job for free. If you bring a part to a repair facility and have it installed and that part fails, then you will have to pay labor again.