Maybe some shops in the UK (more vapers than Germany, last year figures) have them, but where I live (Romania) things move much slower and with a few exceptions are more expensive. Case in point, the Mini costs here around 60 bucks. Don't take my word for it,
check it out.
No Chinese retailer that I know of has those rings yet (it's their
long New Year), otherwise I would've ordered them already. But I'm patient. They will undoubtedly have those soon - maybe even the three-color set. I can order them even from the USA (or anywhere Europe), but shipping costs makes it unworthy.
Speaking of o-rings, I cleaned my tank yesterday, filled it up and kept on vaping until this afternoon, when I entered the kitchen and noticed something red in the sink. It was the ”base” o-ring. Turned out I vaped a full day without it - glass on metal. No leaks whatsoever.