Usualy the price is costly around $60 to $100+ for a 5 x 6 inch board double sided.
Grab an issue of Circuit Cellar Ink. In the back of the mag there are a lot of ad's for just these type of companies.
Here is one that offer a light free version that you can do your own boards. Small but we are talking tiny here!
http://www.cadsoftusa.com/
Would recomend prototype first then do a board. Wish I could cram a PCboard blank through a regualr ink printer. Oh well.