I brought my car into a new mechanic today for brake issues, and they discovered that my rear brake calipers had completely seized up. They gave me an itemized quote for parts (~$700) and labor (~$300).

With my previous mechanic, I shopped around for parts on my own and brought them to him to install. He would charge me his usual $80/hr rate for labor.

These new guys also charge $80/hr, but they want to charge me an additional $15/hr if I bring in my own parts. They argue that if I get the wrong parts, or the parts I get are defective, that it will create more of a hassle for them - thus validating the extra charge. I'd argue that I should have control over the parts they use, and where I buy them.

Is this a typical policy? Is there another arrangement I might be able to offer them?