Another cost-efficient choice is Thrive Architect. The team at Thrive Themes provide you with dozens of conversion-optimised landing page templates. With the drag-and-drop page builder, you can edit these and build pages from scratch. I’ve used this WordPress plugin to build entire websites. You can get access to it as part of Thrive Suite.

Thrive Architect will work on any WordPress theme. It’s not limited to Thrive themes.