10 mostly-assembled boards for $52, shipped.  Used to be you'd spend more than that just on the boards.

("Mostly-assembled" because JLCPCB doesn't have the button domes the design uses.  I could've reworked it for smaller ones that they do have, but since they only need to be held in place with some tape, it'll be just as easy to order the right parts from DigiKey and put them on the boards when they arrive.)