oh lol. Unis here vary from $20,000 to $50,000 and more (12,300 pounds - 31,000 pounds?) But a lot of unis also participate in financial aid from federal, private, and local sources. I don't think there are differences between international and national tuition there. And here, a few states do have ridiculous differences in in-state and out-of-state tuition.
A few states, such as Texas, have a central application process, and then material is sent directly to the uni. But the majority do have their own application process.
Physics for Scientists and Engineers