Charcoal

So I finally bought a new grill today. It's already assembled and there are no "extra" parts. I like to use natural lump charcoal instead of briquettes. Soriana didn't have any and I don't belong to Sam's. Any suggestions where I can find some? It's got to be around as many pollo asada grills use it.

TIA

PS. Would like some mesquite chunks too!