Have you tried Checker/O'Reilly and NAPA?
O'Reilly shows rebuilt caliper from Beck-Arnley, Wagner and Cardone. I used the Raybestos rebuilt caliper and they work fine. The pads aren't as good as Toyota, but the price was so much cheaper than Toyota that you could buy them and still come a lot cheaper.
"Stand your ground. Don't fire unless fired upon, but if they mean to have a war, let it begin here." -- Capt. John Parker