Pep boys estimating me 700-600$ to put on rear drums and replace brakes on my 95 chevy blazer 4×4.

Should i just buy the drums and brakes from auto zone and take it to some other mechanic ?? Is pep boys known to be expensive??
Typo’d "an" where it says and on the question.. oops.
The 700 estimate was for the rear drums, front pads, and to stop a leak in the brake line, also to put in a sway bar bushing on upper control . He wrote me an diagnostics( cost over 100$ for it) that i can not even read half of it because of the horrible hand writing, i dont know what i need to buy to fix it cuz i cant read the danm handwriting, now i got to go again to pep boys in the morning to check it out what he wrote me, god help them if they try to charge me to write out another diagnostics!

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