Yeah, you can find the 3rd Model (1967-1976) BGS jackets and parkas on eBay pretty much any day of the week. The trousers (c1959-1963) , however, come up very rarely and go for about $300 USD these days. Everybody knows what they are and pretty much everybody wants one. Or a third one in my case
The earlier BGS jackets and smocks go for $200-$600 USD.
Sportsmans Guide used to have the Austrian jackets fairly cheap. Probably Major Surplus and Survival or another big one like that still does. At least they have been around in the States lately.
Brushstroke stuff is pretty easy to find, though easier in Europe than here. Prices are all over the place with that stuff. The trousers are usually pretty cheap. I think Sportsmans Guide... never mind the speculation, just confirmed:
Czech vz85 is a little hard to find these days, but I see them on eBay from time to time. vz95 is much harder to find, though I do have a spare set coming to me next month.
Italian stuff can be find any day of the week, no problem with availability. The problem is sorting out which ones are commercial knock offs and which ones are legit issue.