WTB 155mm GXP crankset

Anyone have one for sale? I have Rotor oval chainrings, so don't even need a crank with rings. I'd need a double-chainring crankset.
 
Cobb the 160mm GXP that I need on clearance for $159. I’ll get that if nobody here has a 155mm. My fitter really thinks a 155 is what I need. I’m currently running a 170, so 160 would make a good difference. Thanks!
 
And I’ll do anything reasonable for more speed.

But I’m also CHEAP! Which is why I’d forego the 5mm that my fitter suggests to keep the GXP and go with the 160mm now on clearance. I also could change over to a square taper and get anything from 140mm on up. The square taper crank arms are so easy to swap out. I already have the tools for each setup, so it’s a matter of my pride accepting the cold hard fact that at my piddly power output, it just doesn’t matter.
 
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