This page might be helpful:
https://aas.org/learn/college-departments-offering-astronomy-related-degrees
UW has actually reduced its tuition by state law. Though it can begin to go up in 2017 again, it is held to an increase that is limited to be no more than the annual average percentage growth in the median hourly wage for Washington for the previous 14 years.
What that means is UW is less than you realize right now, it’s coming in around 26K for 2016. For the education it will be extremely hard to beat the opportunities in your major. WSU will the the same or less. Western as you know does not offer Astronomy. Whitman is typically not generous with merit but worth a shot at your stats.
Based on what you’ve shared I suspect you will not qualify for any aid, you do need to get actual financials from your dad and pin him down on a budget.
That said, there are schools offering astronomy in the WUE, some as a major, some a minor and some as a concentration in Physics. You don’t typically need to do anything extra to qualify for WUE, it is part of the application. Most will have honors college options that could be very good for you and often offer extra scholarship monies.
University of Montana
Montana State
University of New Mexico
New Mexico Institute of Mining and Tech
U of Hawaii, Hilo
University of Wyoming
Other States that will be on the more affordable side at your stats would include
University of Maine (flagship match program)
U Mass Amherst
Ohio University
Using telescopes is a very, very small part of an undergraduate astronomy major. In many (possibly most) cases, undergrads will never do any observing. Even in graduate school–and if you want to use telescopes as part of your post-school life, you’re going to need a graduate degree–it’s possible to never use a telescope to gather your own data.
Look for schools that have good physics programs, and have opportunities for undergrads to do astronomy research with professors. UW is really an excellent choice. U Arizona would be a place where you would be able to be hands-on with telescopes; it would also keep travel costs relatively low. If you’re considering Caltech and MIT, also look at Harvey Mudd; if you’re looking at Berkeley, look at the physics program at UCSB’s College of Creative Studies, which is possibly the very best undergrad education in physics in the entire UC system.
And do pin your dad down about how much he can afford. It’s awkward for parents to have to tell their children they can’t afford to send them to any school they can get into, but it’s far far better to hear that now, when you’re considering where to apply.