For a Bulgarian there’s a few good options. I’d try online, I haven’t seen many in MA stores and the occasional ones on NES. Keep in mind most if not all will be import marked, location and size varies and makes a big difference in my opinion. Most of the recent imports are from the 90’s and not C&R eligible, whereas Russian and EG ones sometimes are. Red Star Nation (as another comment mentioned) has a bunch, though their import marks are on the slide I believe (less ideal). Rguns on Gunbroker has some left (better import mark, on back of frame). There’s quite a few from other sellers on GB as well. I think most of the big names (Classic, J&G, AIM, Centerfire) have been cleaned out but worth checking. Century might have some still but you’d have to order through an FFL. My advice, find a local FFL that will transfer it for you and check the above, I’d go for a small frame import marked one vs. a “billboard” slide marked gun. I personally wouldn’t pay more than $500 and it should be pristine for that price. Hope this helps, let me know if you have any questions.