National Student Exchange (NSE)
While you may not be able to study abroad, you can take a quarter, a semester or a year in a college in a different part of the US. At the national level there is the National Student Exchange. Here is their website http://www.nse.org/
College Express keeps a list of the colleges which are members of the National Student Exchange. The link to the list is
http://www.collegexpress.com/lists/list/college-members-of-the-national-student-exchange/314/
The UW's also has a page with more information on National Student Exchange, which can be found at
http://depts.washington.edu/nse/
Western Interstate Commission for Higher Education (WICHE)
Many schools in Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, North Dakota, Oregon, South Dakota, Utah, Washington, and Wyoming have an agreement to allow campus exchanges between students from member states at a lower rate. This means that students generally only have to pay 150% of instate tuition, as opposed to out-of-state tuition, which is usually two or three times as much. WICHE has exchange programs for undergraduates, graduate students, and professional students. You can read more about their programs on their website - http://www.wiche.edu/studentExchange