Just make some loaded calipers yourself the easy way:
-Buy the cheapest pads you can find.
-Buy some semi-loaded calipers.
-Remove any sliding parts that need to be lubed and thoroughly clean and degrease them.
-Bonus: Lube the parts you just cleaned with whatever grease is closest to you. Don't worry about what type of grease it is. Crisco is fine. Do this for only one caliper.
-If new bolts are included, apply copious amounts of some sort of grease to the threads. Try to use at least two different greases.
-Mangle all of the hardware clips as best you can, then straighten them out a bit and put them somewhat near where they belong.
-Put the pads into the calipers with your eyes closed. No peeking.
-Bonus, if you want best quality: remove one bleeder valve, strike the threads with a hammer, then screw it back in and tighten it until it starts to twist a little.
-Put completed units back into their respective boxes.
If you want to make some really good loaded calipers, choose some hole (threaded or unthreaded, it doesn't matter) and drill it out oversize and crooked. If this is a threaded hole, tapping new threads is recommended. Repaint the caliper.