I got a bunch of random NOS switches from an electronics supplier warehouse!
Limited quantities, packs of 35.

Simplified Alps Type 3 - SKCM White (ish) with a third party slider and simplified contacts, all other parts are original. They need cleaning, but are just as good as regular SKCM clickies once cleaned. Ensure they are reassembled with the solid side of the slider towards the click leaf.

The following will be available in the near future:
RRE White - an undocumented Indian-made 5 pin linear MX compatible switch.
RRE Black - very similar to the above, just slightly less smooth.
Space Invaders White 1-eye - A vintage linear switch. Not MX or Alps compatible.