I can help with Bulgaria. Assuming your trip goes through Sofia, the National Military Museum has a decent weapons colelction - just go straight to the top floor. As for buying, unless you really know what you are looking for, my advice is to be cautious. Antique stores are overpriced and flea markets are full of repros, compilations and items in altered condition. Also, generally speaking, there has been a recent surge in interest in arms and armour in Bulgaria and most things are actually cheaper in the States and Western Europe than in Bulgaria.
For more specific advice, let me know what cities you will be in and I will see if there are any places of interest.
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