unfortunately, purple pretty much relies on PEI genesis for the interlocking switches. they are one of the only companies that will order the components and assemble them. right now purple has a number of mc77s waiting for switch assemblies to be finished. the switches have been on order for weeks, and according to UPS will arrive at PEI from costa rica tomorrow. once we finally get them, if there are any left, i'm sure andrew can sell you some, but they wont be available for at least a week from now.
ed