3 power meters for sale:

1 Sram SRM, 172.5mm, 130 BCD, GXP, TT chainrings 54/39, brand new battery, $900 shipped

1 Quarq, 175mm, 130 BCD, GXP, used 53/39 Chainrings OR TT chainringsm $600 shipped

1 Quarq, 172.5mm, 130 BCD, GXP, used 53/39 Chainrings OR TT chainrings, $600 shipped

I have a set of brand new Sram 11sp Road Chainrings, 53/39 that I could include on any of the set above.