The hardest part is finding a 9mm one as I prefer using a filter.
I have quite a few 9mm meerschaums. I suggest looking at MBSD meerschaum pipes, and Black Meerschaum. They are excellent people who sell high quality and large sized meerschaum pipes. There are cheaper ones in the estate page of Black Meerschaum. I have two MBSD 9mm meerschaums and one 9mm Black Meerschaum. They are fantastic.
Also, I suggest using
www.picclick.de to search eBay on their German platform. I do this firstly because 9mm pipes are easier to find in Germany since most of their pipe smokers use filters and secondly because even if a listing ships worldwide eBay, sometimes it does not show up for me when using eBay Canada. Even if the seller doesn’t ship to your country on a listing, you could always use German translation on Google. That’s what I did. The only bad thing recently is the increase in their shipping cost, which isn’t the fault of the sellers.
Many of my 9mm meerschaum came as estates barely used from Germany. I have four 9mm Altinays from German eBay at a fraction of their cost brand new.
One good block meerschaum is definitely worth the money. Like Bremen Pipe Smoker said on YouTube, they are all completely hand made. I would consider it like buying a nice artisan briar pipe.
I hope this helps and you find a great 9mm block meerschaum! You will definitely enjoy it.