I thought this was useful information, so I'd like to post it on this forum, even though it's rather old. I'm currently working on my very first PCB project, and I've gone to a lot of the sites for quotes. I have a relatively simple board, with an ATMega, and accelerometers, and a LiPo charger, with supporting components. The design has 27 components and is only 1.15"x1.25", two-sided. I've received quotes from Elecrow, PCBCart, Advanced Circuits, ITEAD Studio, and maybe I've lost track of the rest. Quotes for fab & assembly (turnkey) were anywhere from $415 all the way $1300 for 10 boards!
Yesterday I saw a post where someone mentioned MacroFab (http://macrofab.net
). Apparently they're starting blow up, and rightfully so. You can drag your Eagle files directly into their web application and it will generate your gerbers and BOM automatically. Then you can choose from their parts list, where they indicate what they have in-house (and cheaper) and what they'll have to order. A handful of parts/packages were not available at low quantities. For example, the regulator in my design was not available in a SOT23, so I had to go with a larger SOT89. It's a pain in the arse, but it's well worth the trouble. The entire time, web app will automatically update the price on the page. I was "quoted" $37 for a single board, fab AND assembly! That's absolutely insane! I went ahead and order ten boards for $260! I really hope that these guys blow up and open doors for hobbyists, so I wanted to spread the word. I'll try to remember to post pics when I receive the boards.
EDIT: Turns out they had the part all along! They're search feature only shows a limited number of results. You can actually search using a Digikey part number, since DK is their main supplier.