I have a nearly new ( only 30 miles on it ) Shimano GRX 2x12 front crankset, 172.5mm cranks, hollowtech II, that was pulled off of a brand new bike.
Asking $120, which is $40 below retail and most ads I see. We'd meet in person in Hendersonville.
I even have the box, Shimano bearing preload nut, all the factory hardware to install them. It's complete.