Barrycuda, could you post what state or province you live in? If you're in the PacificNorthwest, we have an excellent source for lump and a whole bunch cheaper than Royal Oak (not that there's anything wrong with R.O.). If you're up in this neck of the woods, Cash n' Carry, a food service outlet that sells to the general public as well, sells a lump product in 40 lb bags for $13. and change which I really like and it's hard to beat the price.
I do the same thing as JR does, mix lump and briqs on occassion. Depends on what I'm smoking or grilling. That second coal grate sure makes it easier to keep the smaller coals in place.