Shimano J03A ICE-TECH Brake Pads: $$75/4 sets or $45/2 sets (New Price)
I bought these in error: i.e. they don't fit my gravel bike brakes.
Brand new/unused sets (2 pads/spring/pin): $100 for all 4 or 2 sets for $55
Compatible with Shimano XTR BR-M9000 and XT BR-M810 (and many other) brakes.