We’ve added the ability to specify silkscreens on PCBShopper. Some manufacturers offer silkscreen on both sides all the time, while others offer only top silkscreen, and still others charge more for silkscreens on the bottom – sometimes a lot more. Until now, the prices you saw on PCBShopper ignored those differences and simply presented the cheapest silkscreen option. Now, you can specify if you want silkscreens on the top, the bottom, both, or neither.
As with all the specifications on PCBShopper, you should not ask for more than you really want. If all you care about is the top silkscreen, don’t select “Both”; otherwise you’ll get fewer choices and more expensive choices.