My first product is available for purchase!

GPIO Button Adapter
Description:This little shim adds up to six buttons to your Raspberry Pi project. It fits between the Pi and add-on board.

This kit requires soldering. It is recommended to solder the PCB to the Pi’s GPIO header first, and only then to solder on the buttons. Soldering the buttons first makes it difficult to access the GPIO pins.
Buy from:Pi Supply, ModMyPi, EXP Tech