I’ve always (well at least for about the past 20 years) made my own cards. Here are this years’ cards for close family (the bulk cards for everybody else, about 40 of them, are a lot simpler).
I found those teeny tiny micro switches at the coolest electronics store (Gateway Electronics in STL, you could kill hours browsing in there). Link is here: http://www.gatewayelectronics.com/
Forgot to mention, the images are stamped from commercially available stamps from Papertrey Ink, Hero Arts, and Wplus9. I want to make my own!