I can’t really say for certain, as different stores have different prices in different areas.
In general, for a roll of 24 pictures, it seems costs about $10, more or less, depending on the store/area you live in.
Also see ‘Where do you get your film processed?’, ‘Where can I buy film?’, ‘How do you get your film pictures on the computer?’ and ‘Can I scan my own negatives?’
If you need more questions on this subject answered, just put them in my ask box.