I found a web site where you can buy a subscription to the repair manuals for your car that would give the flat rate hours (and would also show you how to do it yourself). I won’t post the URL because I can’t vouch for it and there may be others. But that sounds like a useful way to get repair info about a car.
My son-in-law does brake jobs in the driveway in an afternoon. It’t not hard to learn.
Mechanics usually (I think) get a discount on parts, so they make their money by bumping the price back up to retail plus charging for labor. So unless your mechanic is in the habit of grossly overcharging for parts, I suspect the final cost (of parts plus labor) will be pretty close to what you would pay for a regular brake job.