'World Tank Museum'?
You got it right.
WTM -> www.world-tank-museum.com
This is the official site and they are sold out !
But if you check for ' 1/144 ' on EBay, you will get a few pgs of them at all kind of prices and all kind of publishers. I got a few hundreds of them from a few of the publishers like Takara, Dragon Cando,Panzer Projekt, 21st Century etc,etc.
I also got the Panzertales collector book for WTM, in english. In this book of 98 pgs, I got almost all the tanks and more, in multiple examples.
Ok, enough bragging.