I got a silver 77mm Ltd from Prodigital. Henry's of Toronto have several on eBay right now. There was indeed an 31mm at Prodigital a few days ago but is gone. Looks like they're made in Vietnam, and clearly get to Canada at least.
Seriously, given you have the 40mm, can you elaborate on where does the 31mm fit the lineup? Or is it the legendary-ness?
One can buy 2 less legendary 35mm for that!
Edit: I think the right accessorizing strategy is not to pay the extra $550 for the limited K7, but rather wait until a next model is offered in both black and silver to begin with.