You can now buy Divi child themes, layouts, and plugins in the official Divi marketplace run by Elegant Themes.
Folio Divi child theme from MZ Creative
"Folio is a clean, modern, user friendly, responsive and highly customizable Divi child theme, built especially for Agency and Personal portfolio websites."
Folio Child Theme features;
1) Fully Responsive
2) Unique Design
3) Optimized Speed
4) Free Support + Life time theme updates