Those burgers look excellent, kitchenangel!
As for charcoal, I usually stick to what's available in the store, but I got for the lowest price often. Either that or I wait till Royal Oak is on sale and stock up.
I should qualify that: I go for the best price as long as the charcoal isn't impregnated with lighter fluid. I leave that stuff for the rednecks who don't mind food that tastes like diesel.