I like both the Royal Oak & the new Cowboy lump charcoals pretty well. I have a stockpile of the new Cowboy that will last me until the next Presidential election, so I don't foresee any Royal Oak in my future, but they are both good products.
Lazzari Mesquite lump is available in 40# bags for about $11 at my local restaurant supply. Its decent, but IMO is not as good as the aforementioned products. I think you're doing well to use Royal Oak. If you ever see Wicked Good Weekend Warrior buy it, at any price. lol.