Don't expect any across the board discount in Midway. Their 'dealer price' on many items is within a few cents of their retail price sometimes, sometimes there's no discount at all, and sometimies it's pretty good.
In saying 'sometimes' I don't mean to imply that their discounts vary with the times. It's a figure of my speech meaning "with or on some items".
Hogue wooden grips, for example, is something that seems to get a pretty deep discount, while many other things are very small discounts. It seems to be tied to Midway's cost but so far as I know they don't publish a specific discounting policy anywhere.
Brownell's discounting is meant to give an operating business, a gunsmithing business for the most part of their intention, a little room for profit ON ITEMS WHICH YOU MIGHT REASONABLY HAVE FOR SALE IN YOUR SHOP or be installing on a customer's gun. They generally do not offer any discount for gunsmithing tools (except certain specialized tools) or items which would be part of a shop's supplies. Things like parkerizing and blueing chemicals, things to set up a shop, and most of their work safety items don't get you much if any discount. It's interesting to see and use their policy, but like Midway it is not an across the board cut in prices.
So in neither of those places can you say that a C&R will get a 10, 20, 30, or 50% discount. It's not a set amount like you might get at the theatre for having your AARP card, or your AAA card at a motel at all.