Yeah I've been checking Facebook Marketplace and Kijiji in the major centers across Canada for a while and haven't really seen anything. I have been on the Cadillac forums but that's a good idea to look for vendors, or I guess maybe even used wheels.
I have found one Niche set that I do like and is in stock (EDIT: Lol nope, they just emailed me saying they don't have stock even though their website says they do.. argh):
But there's also a TSW set I like, thanks for the recommend for Tunerworks I will give them a call. Mostly I want someone to tell me a 13mm negative change in offset is ok or not beyond "the wheel manufacturer says it fits"..