I got word that Old Masters Maroger
www.oldmastersmaroger.com is having a sale on their mediums. This is terrific stuff, as you Maroger fans know (both of you know who you are).
My artist friend Sherrie McGraw
http://www.sherriemcgraw.com/home.html
Introduced me to the Old Masters people and I am very happy with their Flemish Medium.
It comes in a tube as shown on my grisaille palatte below.
Maroger is the Ferrari of mediums. It's expensive though and not for the faint of heart.