Ultimately, its "what the market will bear", and North Dakota, if you will forgive the observation, is a big place. Not as big as it appears on a flat map, but still a big place. There will be significant regional variations, depending on how close or far you are from various urban centers, together with the usual market drivers of relative scarcity/abundance.
If you currently get $10/bird on your property, reliably, I'd plan to price there, but be willing to adjust based on what you find at the market in terms of both competition and demand. In my area, you'd be hard pressed to sell those over $4-5, they aren't the breeds sought locally - not enough egg production, not large enough eggs when they do produce, we don't need cold weather hardiness, and most of the local shows have been cancelled, so the majority of the 4H crowd aren't buying for display purposes. Not much call for pet chickens around here, though a barnyard mix from a known productive barnyard will get $3 per hatchling. All of which has nothing to do with the quality of your birds, and everything to do with breed characteristics and local conditions.
In any event, I wish you every fortune in your efforts.
