For every extra queen you desire, you must have a place for her. So get a few nuc boxes. Then as part of your swarm prevention/management, utilize extra queen cells they provide to you. You can also open up the brood chamber every year and suppress swarming by taking out a few frames during swarm season, thus starting small nucs. These provide boosting nucs for weak hives, allow extra queens to be on hand in requeening later in the summer, or for those swarms that always seem to go queenless.
The BEST (as you asked) way to raise queens, is grafting your own. It allows you to select the genetics, time the queens to your schedule, and uses the least resources.
The BEST (as you asked) way to raise queens, is grafting your own. It allows you to select the genetics, time the queens to your schedule, and uses the least resources.