Try Douglas Electronics [
www.Douglas.com] for
ordering the "DEC-style"
handles (ones I received were white) $0.55 USD/handle.
...bottom of page:
http://209.35.53.132/hardware/pcbs/breadboards/accessories.html#dechandles
I think those are card handles, not switch handles. Though I suppose I
could make card handles, too. (I doubt I could do it for $0.55 each,
though.)
Vince