Just heard about yet another bargain-basement overseas PCB fab service. I check out their site... and they're offering 2-layer boards, with all the trimmings, for $2 plus shipping for 10 copies of a 10cm square board.
And if that's not nuts enough, they also do 4- and 6-layer boards. I could get a freakin' 6-layer board (5cm square) done at $74 (plus shipping) for 10 copies. A 4-layer board in the form factor of one of my current Gadgets would run me $30 plus shipping for 10 copies. Given that one of the upcoming Gadgets does call for 4 layers, I may just try this new place. Or maybe Seeed's pricing will get more amazing in the next month or so; who knows?
Hm. The newcomer doesn't have Seeed's range of capabilities, but is amazingly cheap. Capabilities run to 0.006" trace/space; 0.012" to 0.25" drill; pretty much the usual stuff nowadays. Not suitable for those newfangled fine-pitch BGA packages, but I don't think any current order-on-line fab service can handle the crazy feature sizes needed for those. Oh, and quantity pricing looks very favorable, notably unlike Seeed. So, if they do a good job on a January prototype, maybe I'll use 'em for hundred lots once the time comes. (At which point, though, I'll also be having to worry about lining up assembly service, because I have no intention of hand-assembling production units.)
Order 6-layer boards on-line. For $74. My lawn: git off'n it.