Not only do you need to look at the location and cost of living, but also what is included in tuition and what the other fees are as well as the gym facility and coaching ratio and expertise. There are so many variables it is hard to compare. For instance, our gym has a slightly higher monthly tuition than gym x down the road. But, gym x pays a $300 fee in the fall to pay for the coaches to coach the meets whereas our gym owner pays the coaches for meets. At some gyms the monthly tuition can include all meet fees, other gyms it includes nothing and you pay a bunch extra on top of the monthly fee.
Also, gym x may have state of the art equipment, foam pit, tumble track, air conditioning, etc, and gym y may have no AC and only basic equipment.
So, in order to get an idea of what is "fair" for tuition, you may be better off comparing nearby programs where you can also find out all the other variables.