I have a bunch of pads for stock calipers from my E9x m3. I tried out several manufacturers to characterize and experiment with, and now don't have much use for them.
Pagid RS19 F/R: Brand new never used. These list for $730 on Bimmerworld, asking $550 obo.
Carbotech XP12 F/R: SOLD
Cobalt Friction XR1, rear only: SOLD