Designmodo is a popular web design company selling 3 different products.
- Postcards – Email template builder. Starting at $18/mo.
- Slides – Builder for animated static webpages. Starting at $29/mo.
- Startup – Bootstrap template builder. $89/quarter.
They also offer annual billing plans.
They do not say on their website that the commission you can earn is recurring. I would therefore expect that they only pay for the initial sales and not for rebills.