I can confirm that the CVS stores around Blacksburg, Virginia (Virginia Tech) also carry Tri-X. They also have some of that BW400CN stuff, but last time I was there somebody helpfully decided to shove it to the back of the shelf and hide it behind the Tri-X. Every time I go in, there's a different quantity on the shelf, which means that at least one other person buys it regularly. I agree that it's probably mostly high school students, particularly now that school is out and they can't get Plus-X from the photography teacher's bulk loader.