Black Friday only comes once a year, and this year, Elegant Themes are offering 25% off memberships for new customers and 25% off upgrades for current customers, the biggest discount they have ever given. This discount has only ever been offered once before (during last year’s Black Friday and Cyber Monday sale), and it won’t be back again until next year. It wont be available for long, and once the sales have ended you will have to wait a whole year for it to come back (so don’t miss out)!
If you sign up one of Elegant Themes' plans, you can install any WordPress themes including Divi on unlimited websites. So, it will be an affordable solution if you need to install WP themes on multiple sites. If you want to a theme for one or two web-sites, Themeforest themes such as Avada or Enfold will be more affordable.