If you're ever looking to publish any type of book, I have nothing but the highest praise for lulu.com. I don't know how they can provide a service like this for such a low price. These six books cost just under $150 and when you think about how difficult one-off custom printing like this is, that seems like a steal. The whole website and process of creating the books was smooth and ridiculously simple.
Hopefully they stick around for a while so that I can continue to publish books for the coming years.