Here are the Gerber files for a 3pdt true bypass daughter board
The file is for the 4up 5x5cm board. If you buy 10 5x5cm from elecrow you will get at least 40 daughter boards (often you get a few more thrown in free of charge)
https://www.elecrow.com/services/pcb-prototyping/10pcs-2-layer-pcb.html3pdt_multi_gerbs.rar