WTB Stages MTB GXP SRAM or Boost-compatible Quarq/SRM

If anyone has a Stages GXP MTB Sram crank with a Q168 in a size 175mm for sale, let me know! This one https://store.stagescycling.com/Stages-Power-Meter-Stages-Carbon-SRAM-MTB-GXP

Also, looking at any boost-compatible quarq or SRM GXP style cranks.

Thanks!