I buy same region Japanese Blu-Rays to me in the US.
And sometimes region 2 Japan, Region 2 UK. DVD only. Not equipped to do region B.
I buy some imports on Amazon and the others on Ebay.
I know nothing about Facebook groups or any such. I’m sure if you had a list if any are in demand titles someone would bite. Sadly, all collectors seem to care about are steelbooks, grade and condition and slipcovers not the actual movies. Saying that seems sort of hypocritical considering I like my laserdiscs to look like they’ve never been touched if they were opened. and the condition of something is meaningful.