I'm in the fortunate position of working at a University. Last year the student shop (where I buy my sandwiches at lunch time) STARTED selling sheet and roll film! It must be working out for them, as after a month they replaced the fridge they keep it in with one twice the size. Choice is limited to ilford and fuji, and it's little more expensive than mail order, but cheaper than the photography shop in town. They also do Ilford and Kentmere RC paper.