So I'm not the only one. Maybe they get in a hurry and overlook the comments sometimes.
I'd send them an email, ... but I got the code off this board, not from a catalog. Under the circumstances, I don't feel entitled to a discount so I don't want to push the issue. It wasn't a big order (a 10% discount would save me $7), and I needed the stuff so I would have bought it anyway.
I do appreciate the codes y'all post. I've saved some bucks in the past. And if they ever give me a code, I'll pass it on.