I find this kind of interesting. There may not be an answer, but it may be a cool discussion
I'm in Ontario, Canada. Still pretty new to the hobby. I started buying the jars of mibs from antique shop to learn. What I find it there are certain makes that seem more abundant here, but others I have never found.
It seems these are more common around here:
Japanese transitionals, German Striped Transparents, Peltier Rainbos and lots and lots of Alleys
Things that seem elusive around here are CACs, the highly sought after high end Swirls like Superman. Superboy etc.
I assume it has to do more with imports. But I'm curious what others find more commonly and what is elusive in your area.
Thanks!