http://www.aleks.com/

ALEKS is not as pretty as Larson's Math, but it gives the student more flexibility to decide what he/she wants to study. It also goes through calculus.

The nice thing about ALEKS is that it is very affordable for schools to purchase. The cost is around $40/year per student, even for just one student. They also have a free trial if you want to see if your ds would like it.