Yes it's expensive. Especially considering that it's 135-24 instead of 135-36. But it isn't going to break the bank to buy one occasionally. I waste more money than that on Cokes out of the vending machine at work in a month.
I've checked CVS stores from SC up the east coast to NJ, and all of them have a roll or two hanging on the peg.
So come on everybody join in! Every man, every woman, every child. Buy one roll of Tri-X at CVS.
(OK, I'll shut up now.)