The are three dealers on the net carrying them, AG Russell, Cutlery Shoppe, and Discount Knives. Brian definitely has the best prices, I got one from him. These are great knives, and talk about sharp. A great classic brought back to life.
I have and used Marble's knives for the last fifteen years and I really like quality. I've held both old versions and the new versions of the knives are very nice. I'm glad they started the knife line back up 2-3 years ago. I currently have the Scout, Expert, Woodcraft (original), Plainsman and Fieldcraft. All have been scary sharp when I receive them. Maybe someone could explain the sharpening or finishing process that is used: The edge is scary sharp but I can't actually see the grind lines of the edge? Could be a polished edge? I've held the Bison and Trailmakers; they are on my list of knives to buy (as soon as I scrounge money to buy the Bladefourm.com specials). I've seen these knives dress all types of game and still remain sharp.
LD, I purchased my Marbles directly from the plant, but, Discount Knives have Marbles at greatly reduced prices. I'll get mine from there in the future.