I have to wonder if Alcumus (9000 maths problems) and AoPS aren't giving EPGY a run for their money. I think for the same $500 to EPGY you could buy the whole AoPS books grade 6 - 12 with solutions guides. And Alcumus is currently free. And they have Beast Academy for younger kids. Just saying.

http://www.artofproblemsolving.com/Store/curriculum.php
http://www.artofproblemsolving.com/liz/Alcumus/index.php