Like oldhaole said earlier, it ain't like the old days...
You can go there and grow your personal stash, but you ain't gonna do any massive grow.
In 1978, a buddy of mine used to get regular shipments in the mail from his friend in Hawaii..
Huge ice chests like fishermen use, were packed with vacuum bags of dried buds and completely sealed up with sealing wax..
He got several of these each year..
But those days are long gone...
Isn't Mother Nature grand !