I got 5 yampad PCBs for $2 when I was ordering another PCBs on JLCPCB. Literally the cheapest numpad to put together. Just add some diodes, hot swap sockets, a case, and a promicro and you're good to go. Oled screen and LED underglow are optional. yampad v1

I have a gmmk pro as well but can't justify the price for their numpad. But overall I love your theme and colors.