@katerpillarca Good for you for trying to figure out viable options. Without knowing exactly what your parents are willing/able to pay or their eligibility for need-based aid, here are some somewhat more affordable options for smaller to mid sized schools that might fit your needs and offer merit-based scholarships that you might be able to get (upping your standardized test scores would help your chances). Maximum merit you are likely to get from LACs that offer it is typically in the 20-30K range, leaving at least 40K+ to pay.
U of Puget Sound - Tacoma, WA. Not Manhattan, but not rural either. Offers merit scholarships for which you might be eligible. Other PNW LACs with merit include Lewis & Clark (near Portland) and Willamette (Salem, OR).
Macalaster - St Paul, MN. This I really like for you. As of application cycle of 2016-17, maximum merit scholarship was 20K. Strong in Political Science, IR, not sure about the environmental sci.
Women’s colleges that offer merit scholarships: Bryn Mawr (near Philadelphia), Smith (cute New England town two hours from Boston).
Tulane - New Orleans. Apply early for best results and show interest. Merit money is getting tougher there but still possible.
Case-Western, Cleveland OH - Show interest. Merit money possible. Admissions outcomes are very unpredictable. Not just a tech school.
Somebody up thread mentioned the Claremont Consortium. Scripps offers some merit aid as does Claremont. Admission and scholarships are very competitive; here in particular higher test scores would help.
Public options that might come in cheaper than in state with your stats: Arizona State/Barrett Honors College, U of Arizona, U of New Mexico. Not small and quality of in-state options might be better. But as your financial situation is a bit opaque, these might be good financial and admissions safeties.
Western Washington: about 15K students, has the majors that interest you, in Bellingham, WA (not a city but a decent sized town of about 100,000 students located midway between Seattle and Vancouver, CA). With your stats, you’d likely qualify for WUE discount and maybe admission to honors program. Cost would be less than some in-state options. If interested, apply early as WUE money is finite.
Good luck!