I do realize that there is an acceptable price for everything. But no one is going to make those brackets for $100. If you dont want to pay for what it is actually worth then you have no business upgrading your brakes. You can go get duralast gold brake pads for $35 and be happy.
I myself would pay $300 for those brackets even though I can make them myself. And I would just get me a set if they were available, but now I see why no one makes them, since "they should be worth $100"