Bought a legitimate "like NIB" Canon FL 28/3.5 lens with original Canon case from a Facebook Marketplace seller yesterday. They had a fairly sizable collection of lenses, filters, and two FTb cameras. I was also interested in an FTb (one was an FTbn I believe), but I hated the match needle meter (never used one before, now I know I don't like it). Everything was in great shape and the prices were fair ($50 for each body and most of the lenses were $40-$50). I negotiated the 28mm down to $40 from $50.
I'm currently wringing it out on my M43 digital before I use it on film. I normally go for faster glass because I'm a available light shooter, but decided to give this a try considering the price and condition. Most of my "wide angle" needs are outdoor shots anyway.
While I was in that region (25 miles from home), I stopped by Ace Photo, fondled an M3 (first time ever, it was smoother/quieter than I expected) inspected a Leica 35mm/3.5 Summaron ($600, looked to be in great shape), and walked out with two rolls of Cinestill XX 120.
Chris