If you are wanting something similar to D & P processing (i.e. nothing fancy or large format) the best and cheapest way is to take a disc or memory card of your pictures down to your local Boots (I think others may do this as well) and stick it in the machine there. Check on the conditions of use first as there are some very good bargains to be had.
Very cheap to do, good quality pictures. Hardly worh your while doing them yourself.
If you are doing out of the ordinary pictures then dedicated photo printers are definitely worthwhile. Get one with separate ink cartridges.