Yeah, if you only make two parts it is expensive.
I looked up the numbers in my BOM from back when I was building those kits and the Viper brackets were $30 each. The brackets that I used to sell to mount Wilwoods on 11.75 rotors were $35 each. Those were three dimensional parts carved from steel but the machinist had a cool way of hogging the material away that saved a lot of time.
I never built in very high volumes, I usually ran 20 or 30 parts at a time. It is a balancing act. You have to give the machine shop enough business to make it profitable for them without killing yourself with inventory. 30 brackets would be 15 kits and $1000 check to the shop. But the kits sold for $150 so you double your money on every batch.
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