Oh yes, the MX Chicony 51X1 boards are a fine source. The 5161 I had was vintage blue. Also old Dolch that is earlier production year... though unless you can get the seller to take a very detailed picture of the switch to see that big logo on there it's a crap shoot. Probably best chance on PAC 486, 62, 63 or the very oldest ones that are not 1813, but that other with the **** keycaps. There are also some rebranded PAC, but I forget the brand names, they also have 1813.
Older G80 have been pretty dry on ebay US for some time, but they do still come up fairly frequently on ebay.de and taobao if you want to gamble.
Said SkiData now owned by Greystoke was mine, and I exchanged the switches in it. All SkiData come with clears default so don't bother looking there.