Stop & Shop? Shaws? Whole Foods?

Like pick your own or local farms?

I’m looking for a particular kind

Dave’s market or the Winter farmers market. RI mushroom company.

If you are looking for non grocery/cooking based mushrooms. You’re on your own.

If the kind you’re looking for aren’t illegal to posses then people have offered great recommendations already.

If they are illegal to posses you should not be using this Reddit to locate them. That’s stupid.

Might be helpful if you shared which kind... but I agree with another poster, the largest selection of mushrooms I've seen are at the farmers markets

Foraging