Correct, I’ve taught a few people how to cultivate their own. I’m Suprised truffles are not more popular. You can get a bag of pre-sterilized grain or do it yourself and knock it up and your done. Just leave it in a closet for a few months to form sclerotia and harvest when ready.
If you have the proper climate you can also use wood chips for the more potent ones and add them to your landscaping around the house. Nobody would be the wiser and it’s extremely difficult to make a case out of that.