Suspend the program offering in-state tuition to residents of border counties. They go out of their way to not pay WA sales tax, so they are not supporting our schools, the state is just giving them a free handout.
Also, end the program offering in-state tuition to 'undocumented' students. If you're not a resident of WA, you pay out of state. if you're not a citizen of the US, you don't get to go to a WA college without a student visa.