These are plastic chips, likely 'casino grade' as opposed to consumer/home grade. The cheaper the chip, the more imperfections and sloppiness from manufacturing. Whereas these B&G or Abbiati chips are going to be a very high quality. Unfortunately these companies won't sell to you, or at least not with a very large order. This means you want to find used/vintage casino chips for sale. This could be via
eBay or other local auction/marketplace.
The classifieds here are perhaps 10% European, which would probably make shipping reasonable. Most folks here focus on clay chips which feel and look a bit different than these plastic chips you've seen. However, if you haven't been hands-on yet with good chips, you won't really know what you like until you handle them in person.
Long story short, most high end chips aren't available for sale new, so you need to find a good used set.
Lots of budget chips are available, and presumably with reasonable shipping to Bulgaria, but they come with quality tradeoffs.
You don't need the world's best chips to have fun playing poker with your friends however, so if the goal is to get a game going, hyper focusing on chips will be a distraction.
Good luck
