IXL.com‎ is another math online resource. I didn't find it very appealing but it might be good for test-taking practice.

I think the appeal of DreamBox for me is that it feels a bit like a modern day Montessori math. As an adult, I have the patience to sit through it but DD didn't.

Beast Academy while it is not an online course seems like a challenging curriculum and it is definitely cheaper than therapy. laugh If I were homeschooling or afterschooling, I'd combine SM and BA then move onto AoP.