The Compass Classroom Membership might be one of the best bargains for homeschoolers, and it's available at three tiers to suit the needs of each family. You can subscribe by the month or the year.
Compass Classroom includes at least 30 courses, many of which I have reviewed. Among them are Antiquity, American History, Modernity, and Christendom by Dave Raymond; Economics for Everybody; Calculus for Everyone; Devotional Biology; Visual Latin; the Creative Writing Through Literature series; Creation Science; WordUp!; Filmmaking from the First Directors, The Story of Great Music, Philosophy: Consequences of Ideas, and the How Should We Then Live? series. (A few of their courses are also available for purchase: How Should We Then Live?, Philosophy: Consequences of Ideas, The Story of Great Music, and Strange New World.)
The Bronze level gives you access to all digital courses along with PDF handouts and resources.
The Silver level provides up to four members of your family with access to digital courses (with individual course tracking for each student). It also includes the option of Facilitation for some courses that provides students with more interaction and oversight. For Facilitated courses, students need to enroll in a course on a set schedule. They will work on their own through the course but also participate in Zoom meetings and online discussions to interact with other students and ask the facilitator questions.
The Gold level adds grading for all courses, a Writing and Math Lab for homework help, and support for parents.
Compass Classroom can provide a substantial part of your curriculum for high school students, and some courses are available for younger students. There are courses for many, but not all, subject areas for high school, including history, science, language arts, math, the fine arts, economics, and worldview. Some courses are supplemental but many are complete, two-semester courses with assignments, tests, and answer keys.
Courses are accessed online through your account. Students only mark course components completed and do not submit anything online unless they are enrolled at the Gold level. The program does not test students or record grades. Written work needs to be evaluated by a parent or teacher, except at the Gold level, which includes grading services.
Many of the courses are taught from a Christian (primarily Protestant) worldview. This is especially so with Dave Raymond’s history courses, the Old Western Culture courses, Devotional Biology, the Is Genesis History? Bible study, Philosophy: Consequences of Ideas, and the How Should We Then Live? series. Because of this, those who want their students to learn a Christian worldview should find the Compass Classroom Membership options especially attractive. You can check them out with a two-week free trial, and you don't have to enter your credit card information until you buy.