I already own a M6 Mark II and eight Canon M-mount lenses (one of them the Sigma 56mm). Availability of the body is bad to say the least, and the prices are going up. I know there are some people who believe otherwise, but I think the Canon M-mount will die and it will be phased out by (worse in my opinion) RF-S lens equivalents.
I’ve already read the other M6 Mark II buying thread, but most people there seem to only have one, maybe two, systems, and they still see full-frame as a viable upgrade path. I’ve already a pretty complete RF kit, but I also own & love cameras and lenses for MFT, Fujifilm X, and Leica M. Compared to all the gear I own it is hard to justify the purchase of a second body just-in-case as a future backup if you know what I mean. On the other hand the worst-case would be to break my M6 Mark II, and then to sell all of my Canon M-mount lenses (small beloved primes included), because I couldn’t get a body for them anymore.
I don’t see any deals anymore. The cheapest I’ve found so far is $10 more expensive for body & kit lens than the kit I’ve got (body, kit lens, EVF) two years ago.