I'm told they get their coal Centralia Coal Sales. Centralia is the sales agent for a variety of different breakers. Here's the link to the different breakers they supply from: http://www.centraliacoal.com/l1.html
I purchased from CSM last year and thought their coal was pretty good with the exception of a few big rocks, the debris in the coal and those darn plactic fiber bags (I really hate those bags). I am using Blaschak currently and the ash content is much higher and the temp slighly lower than last year's coal from CSM.