Calavera and I bought the last of 7bit's stock a while ago, and he's the only reliable source for these. They were pretty pricey, I think we paid ~$95 for 100 each. This was out the door, so after shipping, currency conversion, and paypal fees. I tried sourcing from other places that had them, but cheapest was like $2 per switch before shipping/tax.
These are one of my favorites after putting in a light spring. The click is soft, not as sharp and annoying as mx blues, but the tactile feel is more defined than mx browns or ergo-clears. They feel amazing after lubing, however these are the hardest to lube.