I can highly recommend the independent bottler Malternative (Webwinkel - malternative-belgium). For me it’s a local guy called Pieter Knapen who really knows his stuff. He also has some GotA bottles in his shop en knows Sacha from Armagnac.de as well.
I sourced 1 bottled recently but not tasted : supposed to be really great (mean 91-92 for bloggers).
Good choice for the first one
And recently too, I bought the last one from their bottlings called Les Bons Vivants 2 which is a Petite Champagne 1973 from Grosperrin (53,6%) : first nose a bit fruity but not that much, it takes time then it opens a lot on fruits and spices with a very long finish. Very great.