I just decided NOT to go with seeedstduio for a while. They excluded PCB service from $50 free shipping. They've been doing this for years but just removed it. This triggered me to look at alternative, iteadstudio.
I had some quote dispute with itead a few years back. I do 100-200 boards at a time for some of my kits. One guy gave a price and the other guy would give a very different one, like twice as expensive. Confusing a whole lot. I decided to drop them and return to seeed, knowing they were a bit more expensive, but discovered the free shipping.
Now I took another look at itead, they have slightly lower priced 10*10 boards ($5 less) and shipping is quite a bit more reasonable compared with seeed. I'll see how they handle 100-200 board quotes.
I know CR has been using/recommending itead