Bayonets are drying up here also. I'm fortunate that I started collecting before that happened and have most types already. I still have a few guys in the area that deal in them. Most of my purchases were online and most of them ebay. I learned to be patient, wait on my price because someone will always list another one if the first goes too high. My most recent purchase has not yet arrived. A Vietnam production 1917 trench gun bayonet. I've actually picked up a few recently, full length ItalianVetterli, and the Danish
rolling block bayonet. Prior to that, might not have bought one in six months. Good places to look are antique shops and malls, flea markets and yard sales. I try to have one for each rifle I own and I think I'm current. Not sure if my Chinese Hanyang bayonet is legit or not, and technically, I have two Polish rifles and one bayonet. Might be short a Japanese
bayonet also. I am actively seeking an SA marked folding Carcano bayonet. I have three or four of them now but none are SA marked and I have an SA marked rifle.
I don't know how far you are interested in traveling but I've been told there is a great flea market in Conneticutt twice a year called the white elephant or something like that. I have yet to go there personally, probably a 6 hour drive but it's supposed to take two days to get through it and I don't know if you even manage that. Supposed to have a fair amount of military stuff.