Dunkin Donuts original regular blend grounds. 5# bags @ Costco. Nothing better for 'company' coffee brewers.
I've spent the last 30 years on a Quixotic quest for the perfect strong but mellow brew - light roast Ethiopian Yrgicheffe is the best I've found, especially brewed espresso style, but is not easy to come by any more. Dunkin's coffee comes as close as any commercial grounds to it and is relatively inexpensive in bulk. We go through about 5-6 pounds a week in an office of 10. Obviously, took a spammer for me to see this.