I just picked up Yeti Flake #4 and think its very good. I asked COJs who blends it and they confirmed it is Kolhause and Kopp. Not a bad deal for $8 a tin.
#5 Bigfoot Flake, with dark Virginias and a light caramel flavoring, is a pleasant blend. I never transferred it from the tin, and didn't need to because I smoked it right up. It was one of my first, maybe my first, flakes.
I have 5 tins of the Yeti flake but haven't tried it, but reading the reviews of it sound amazing.
http://www.tobaccoreviews.com/blend/9326/cup-o-joes-4-yeti-flake
Plus it probably has a few years of age on it as it was 15$ originally and then they put it on sale for 8$, so I figure there has to be at least 2 years of age already on them.