Switch found in the box

[Ghost]

I didn't find one either, were they supposed to be standard issue?

You should get a little switch with your order, but they are small and easily overlooked, and from reading about it, they were being packaged loose in the outer bubble mailer/jiffy bag, rather than in the box with the Pine unit. Easy to open the package and the switch just falls out onto the floor, or alternatively gets stuck right in the corner of the mailer and is assumed missing. 

At any rate, it is just a fairly bog-standard tact switch, you can buy them very cheaply. Or you can use any other momentary on switch you can find/appropriate. I like ripping switches off other things and attaching them to my projects.