Might be these days. But a decade ago it was fucking everywhere. So many people I know who thought they experienced their first LSD trip were actually sold an NBOMe instead, myself included.
When I finally got the opportunity to try real LSD, I was seriously disappointed. I was like, "where are the pretty colors"? And that's when I learned that LSD is more of a mental trip than a visual one. The headspace is totally different too. Felt like a schizophrenic on the stuff. I can fake being sober on 25i, not so much on acid.