I bought a pack of four 9.5mm tact switches at radio shack (which I had no idea still existed or sold electronic parts).

Important! Make sure if you don't buy the right size switch that you cut your switch down to the right size. I didn't, and when I glued the facepiece back on at the end, it held down the power switch and I had to take it off and sand the switch down.

Also, make sure you put a tiny bit of solder on all of the faces (8 total faces for four connections) before you try to solder them together. It'll be a lot easier to bond them. Afterward.