1. University of the People: Offers various science courses, including Biology, Chemistry, Physics, and Computer Science. It's a tuition-free university, and students only pay a small administrative fee.
2. Coursera: Provides online courses from top universities and institutions worldwide, covering a wide range of science topics. Many courses are offered for free, while others have a fee for certification or specialization.
3. edX: Another platform that offers online courses from leading universities, including science courses such as Biology, Chemistry, Physics, and Data Science. Some courses are free, and some require a fee for a verified certificate or specialization.
4. Khan Academy: Offers free online courses and videos on various subjects, including science. It covers topics like Biology, Chemistry, Physics, and Mathematics, from beginner to advanced levels.
5. OpenStax: Provides free online textbooks, videos, and resources for science courses, including Biology, Chemistry, Physics, and more. It's an excellent resource for self-paced learning and supplementing your studies.
6. Alison: Offers free online courses on various topics, including science. You can find courses on Biology, Chemistry, Physics, Computer Science, and many more.
These are just a few examples of affordable online schools that offer science courses. It's essential to research and compare different platforms and courses to find those that best fit your learning needs and budget.