Kazakhstan 1oz and 2oz

Why are Kazakhstan coins so hard to source in the UK?

There are a few on eBay, but they command huge premiums even when going to auction.

Are they sold in low numbers?

I bought some gold coins around 6 years ago and I think they had a wolf on them. I read some articles how their standard of living was expected to improve massively under the Belt and Road Initiative so I figured getting my hands on some might pay at a later date if their middle class grew over the next decade or so. I will need to dig out my spreasheet but as far as I can remember they were only slightly more expensive than popular Western gold