There's lots of options! Try lulu.com if you're interested in print-on-demand services? Basically if somebody orders a copy it gets put together on the fly so you don't have to order 500 copies yourself, it all gets sorted. You can purchase an ISBN and get it all done officially through there and everything.
Alternatively you could try publishing it as an EBook? I'd recommend SmashWords as they distribute to all the main e-stores, iTunes etc. Also Amazon do both Print and EBook so take a look at what they have to offer.
There's so many options for budding authors interested in self-publishing nowadays :]
Hope this helps