Types of Hamsters?

I'm curious, hamster owners, about your hamsters. I know that the golden, or Syrian, hamsters are the most common pet hamsters, and that dwarf hamsters are also available.

But I was doing research on a hamster article and I see that there's several other types of hamsters, like the Romanian hamster and the European varieties of black-bellied hamsters. Are these also kept as pets? I've never seen them available, but then again, I don't think I ever looked -- or even thought to look.

In addition, the IUCN has several hamsters as endangered or threatened in the wild, mostly due to their limited range and threatened habitat. I'd love to hear your input on this.

Thanks so much!