I would raise queens via the Hopkins method. Once the queen cells are ripe, put a queen cell in a nuc box with two frames of capped brood, a frame of honey, and a frame of pollen. You could also do a frame of open brood and a frame of capped brood if you wish. The queen will hatch, mate, and begin to lay. It will have the benefit of local genetics - she will breed to drones that survive in your area. Also, you won't have the expense of buying the queens, which would make a huge dent in your profits. The Hopkins method of queen rearing involves no grafting, produces a large number of queens, and is not labor intensive. I will be doing this as well next year to increase my hive numbers.