Think they are still available directly from Dr Grabow, contact them at:
Debbie.Osborne@internationalpipes.com
Or you can call them at 336-372-5521
If that doesn't pan out I'm sure Paul's Pipe Shop of Flint, Mi has them, as her has a whole wall of Viking pipes for sale, and a massive inventory of NOS items.
Call him as his online inventory is only a minute fraction of his total inventory:
Paul's Pipe Shop