International students seeking a bachelor's degree in theoretical physics or physics with astronomy may find limited options in the US, with few universities offering tuition between $10,000 and $15,000 per year. Community colleges are suggested as a cost-effective alternative for the first two years, with tuition around $5,000 annually. The California State University (CSU) system is highlighted as a viable option within the desired price range, while the University of California (UC) system is noted to be more expensive. Canadian universities also present opportunities within this budget, especially when considering currency differences. Overall, exploring community colleges and specific state schools may provide the best financial options for international students.