Bringing parts to auto repair shop - opinions

[jalenz]

Of the 2 shops that I have serviced my 87 300D for the last 8 years, one would NOT allow me to bring my own parts and the other one will. I understand that when I buy my own parts that the shop cannot warranty the part. However, I like the option of bringing my own parts to save $. I recently replaced my fuel injection pump and saved approx. $700 by sourcing a rebuilt pump myself. I also saved approx. $500 on also sourcing rebuilt A/C compressor myself and then having it installed by auto shop.

1) Does your shop allow you to bring your own parts?
2) Do very many other people want to source their own parts?
3) Other comments on this subject?