One place that I find uncut or rough cut gems and minerals is
gem, mineral and fossil shows
type in that phrase, but type in where you live with it and see what comes up for shows.
Usually you'll find them in a exposition type center, or theater, or sometimes The Holiday Inns will host these (with about 25 vendors).
Usually about 200 vendors will be at a big arena, and about 4 will just carry rough cut crystals, the rest is beads and jewelry (then inquire about Brazilian vendors(best prices).
I am sorry, all the jewelers that I work with don't want to tell who they buy their gems from. I find that selffish as I like to share everything I know.
If you want you can type in your state/gov and them apply for your wholesale license (it's free ) and buy at wholesale prices.
Best wishes.
Rough cut, or polished, it's okay. You can cleanse your crystals and bring them back to life.
If you're not digging them up, who knows who handled them? Don't worry about that, just stay present and focus on your good energy going into the stone(s).
I think that any mineral that comes my way is meant for me. Some threads have stated that crystals seems to either find their way to you, or leave when their time is done. Either way it's a blessing to find them.