One thing to think about is how with a public university you may well be there for five years. That should be factored into your financial calculations. Private art colleges are more expensive on a per-year basis, but you can end up spending one fewer year. There are exceptions, of course, so it’s best to look at each school’s program.
Check out University of Central Florida in Orlando. Fairly inexpensive for OOS students with a top-notch animation program (not sure about 2D and storyboarding specifically). You will likely be there more than four years and they might require a summer residency (all the public Florida colleges do this, I think).
There is also FSU which has a great animation program as part of it’s film school. Not sure of tuition or admission requirements.
SCAD has the storyboarding minor, as you probably know. What you might not know is that they offer academic and achievement (creative) scholarships depending on your stats and your portfolio. It may turn out to be more affordable than you think and you should be able to get out of there in four years if you stay on top of what you need to graduate. Your academic advisor can help you there.
One more school to consider - and it is nowhere near the SE - is Columbia College of Chicago. They have an animation major that allows you to focus on 2D specifically, offer merit aid, and are relatively affordable for a private school (and again you should be able to get out of there in four years).
My D2 has SCAD as her first-choice and UCF as a second choice. She also plans to do animation/storyboarding and also prefers 2D (although she realizes that at the BFA level at least one should be well versed in both).
Good luck to you!