When you say process do you mean develop only or develop/scan with prints? the price differs sharply depending on film type and options.
My local lab does C41 and B&W (in 35mm or 120) for £2.50 a roll develop only, £5 for E6. scanning at low res is another £3.99 per roll on top and if you want prints it's going to cost you at least another £5 a roll; the costs add up quick when you want more than dev only, which is why i get develop only and scan myself. Though i'm lucky and they dev E6 and B&W twice a week so i never have to wait too long for film back.