US source of Panzerholtz?

"BDR", means this company, re sourcing smaller bits (less than skids) of panzerholz in North America.

http://www.bdrsound.com/contact-us.html

Briefly looked into accessing some Panzerholtz and ran into 
the same issues as the OP specifically distribution and machining.
Ended up going with some Bamboo laminated sheet material
a friend uses in his manufacturing facility and price was
right shall we say.

Not in quite in the same league as PH but this stuff is also abrasive to cutters and very dense due to the many laminated layers.

At one point I made the regrettable decision to run an edge on the jointer
and it became immediately obvious just where the layers were laminated as it left matching groves in my new blades there after only very good carbide and replace when dulled.

Picture of plinth in my system page.

Right Teo, you need diamond tooling for this. Rich, far cheaper, easier to get and deal with is solid surface material. I like quartz products best. You can go to installers and get cut offs cheap. Laminate it with a plate of aluminum in between and you'll have a wonderful plinth.  

I did a DIY plinth several years ago and settled on Corian/MDF/Corian.  The MDF was soaked with a very thin 2 part epoxy (Smith Systems Clear Penetrating Epoxy Sealer or CPES), sort of a poor man's Panzerholtz.  The results were quite impressive and very inexpensive to build.

https://www.diyaudio.com/forums/analogue-source/312473-diy-cld-plinth-design-measured-approach.html