If you have a GFS (Gordons Food Service) in the area, they sell lump in 20# bags for around 12 bucks. It is made by royal oak and leaves very little ash. It does burn very hot but is easily controlled by air flow. Most people I know usually use briqs in their UDS smokers because you get a very long burn at lower temps.
Trailmaster LE, Brinkman Gourmet Charcoal, ECB, 30 gal drum horizontal charcoal grill