I am pretty sure there are a few 2017 ... even 2016 CAAD 12s out there ... just because one branch of REI might be out ... but whatever. Nothing I care enough to fight over.

I am still not sure why OP wants an Al frame. Pretty much the only reasons I could imagine would be to race crits with less fear of crash damage, or to have a bike with rack mounts ( a lot of CF bikes apparently cannot support the load on their seat stays.)

Considering that a bike's frame is nearly indestructible in normal use, I'd buy used and strip off the excess. But seriously, check Lynskey on EBay ... for a grand you can get a new Ti frame and fork.

Or ... buy an older CAAD and replace what you don't like. Unless it was crashed Really badly, the frame will be just as good after a year or two.