thrivethemes.com is $19/month but they bill annually so it’s not affordable at $228.
It’s very useful though. They offer:
Landing Pages – over 150 templates and they’re organized into sets that create cool looking sales funnels Thrive Leads – opt-in forms
Thrive Headline Optimizer – headline split tests
Thrive Ultimatum – scarcity/calls to action
A bunch of conversion focused WordPress themes