I love their fire sauces, but I feel kind of weird asking for it since I don't plan to order anything from there. I do occasionally eat there. I even tried to look for their sauce bottles in Walmart and Target, but they didn't have any.
Buy something and, if at a drive-thru, ask for extra Fire sauce. That's what I do. Yesterday, I went inside and just grabbed a fistful of them. I also discovered their "hotter than Fire" Diablo sauce. It really isn't hotter than Fire by much, but it tastes smokier. I tried it out and, after two packets, but them all back and grabbed more Fire sauce. Fire = Good!