Also those courses are very helpful for home school parents. For other kids, it can be supplemental resources to help kids to get their feet wet before they learn these courses next school year. Or it is alternative to the other summer camps for your kids. Johns Hopkins University’s CTY summer programs are very good. But if for some reasons, some parents can’t find the time to drive and drop off kids there, or can’t find a car-pool, or even can’t afford the expensive camp fees ( it is around $2000 per 3 weeks day camp, more expensive for the residential camp. ), you can buy some of the courses from theGreatCourses.com for your kids to watch at home. Though it may lack of the interactive environment as at the camp, it is much cheaper. 🙂
Wow! Almost forget to mention that don’t be scared by the list price on the website.
For example: Algebra I list price is: $254.95, I got it at $54.95.
Secrets of Mental Math, list price: $199.95, I got it at $19.95.
There are 70% off sales all the time. There are some 80% off sales near month end, or before holidays, etc.
If you live in northern Virginia, you can get free shipping.