The easy way is to ask for your pictures to be put on CD when they are being developed, or take the negatives back and ask for post-processing onto CD. Obviously a cost is involved.
As Gary says 'dedicated' film scanners are quite expensive, though good ones are now available AT sub �100.
I would opt for a standard scanner which has a built-in negative holder. These will allow you to scan in around four pictures simultaneously, and thanks to modern advances are very good indeed. Roughly �50 to �100.