Pretty much any switch will work here. I used a small enclosure by BUD Industries (from Mouser)

I made 2 holes in some perf board for a couple of tact switches. They have a nice feel to them.

I've ordered a prototype PCB for this enclosure from BatchPCB and will make it available on their market place once I verify that it works.

Update: You can now get a PCB for the enclosure for 5.00$ There is a 10$ per order set up charge from them so you might also want to order the connector PCB at the same time.