The one problem with the whole darknet markets movement is that at some point in time, your unencrypted address will be on a computer at some point. Specifically when it's unencrypted for shipment. Now if your vendor practice good opsec, he or she will delete it after shipped. If they dont have good opsec, they won't.
You can have the best OPSEC in the world and still get a visit from the Feds because of your vendors shitty OPSEC. And they're absolutely interested in small buyers. Just some food for thought.
Which is why I consume all my drugs as fast as possible.