Hmm. I get $5
per board, and that's assuming you can get quantity 100 of
each of the module types! For a single replica, you'd pay more per board.
I didn't get prices around $2 until quantities closer to 250 per design.
Unless you know some place a lot cheaper than I do.
Say $.25 to $.50 per sqr inch 4 layer. Contact fingers extra but not
a whole lot, Pre-panelized (say 100 1x2" breakaway pcbs on a 14X18
panel) maybe 10,000 sq inches purchase qty (50 panels).
If you use a 12x14 panel with no silk screen or solder mask and
choose PCBExpress you can get down to $.12 per square inch.
Grant