I'd be wary of what shows up on pcbshopper website and double-check everything with the actual fab as there are some discrepancies. For example, it shows easyeda as the cheapest option when I select 4 mil traces/8 mil drills, but they can only make 6 mil traces/12 mil drills (which you can clearly see on their website).
I take PCBShopper's accuracy very seriously. PCBShopper gets its prices by querying manufacturers' web sites, so it's inherently accurate and when a manufacturer changes its prices on its web site, PCBShopper picks it up automatically and immediately.
But sometimes, manufacturers change their capabilities without letting me know and without changing the back-end code on their site. As soon as I find out about these changes, I fix PCBShopper very quickly - usually in 24 hours or less.
For example, I have just fixed PCBShopper's reporting of EasyEDA's 4 mil trace/8 mil drill capabilities (i.e. PCBShopper no longer shows EasyEDA as an option for those specs). Not to brag, but I fixed this problem 20 minutes after it was reported.
There's a Contact Us link on PCBShopper's site. I urge everyone to use it when they find an error on PCBShopper. Your e-mail will not vanish into an opaque bureaucracy. PCBShopper is just me, and I'm very responsive.
- Bob Alexander
PCBShopper.com