Not sure if it is just me, but trying to find a source for Lenz double slip switches is not for the faint of heart. There is a place in BC but they wanted to surcharge 20% for special orders.
I did find a place in Ill. that says they will have a few for me in three weeks. $175 each delivered to the East Coast.
Decent folks on the phone:
Reynauld’s Euro-Imports, Inc
1 630 365 6340
I will post results when in.