As someone with ties to IDEA educators, let me tell you significant disparities exist and have existed for some time across states. I am in a blue state, bordered by a red state. Occasionally parents will move across the border, seduced by what they believe are lower taxes (they turn out not to be) and lower house prices. They almost all come screaming back to the blue state because the education for their disabled child is so much worse.
As someone with ties to IDEA educators, let me tell you significant disparities exist and have existed for some time across states. I am in a blue state, bordered by a red state. Occasionally parents will move across the border, seduced by what they believe are lower taxes (they turn out not to be) and lower house prices. They almost all come screaming back to the blue state because the education for their disabled child is so much worse.