You have never tasted anything like the unpasteurized bliss available in special Paris shops- check "points de vente" on pascalbeillevaire.com
Butter is not even mentioned on the website (merely their cheese) so go to the shop best suited to your whereabouts and buy a package or two of beurre cru croquant. Bliss bliss bliss.
Choose the shop that best suits your own Paris address via www.pascalbeillevaire.com