WP Plugins, The App Store for WordPress, is aimed at improving the quality, support for and standard of WordPress premium plugins. If you’re looking for a plugin, you’ll be happy to know that the team assess, check and scrutinise every plugin on site to ensure they’re of highest quality. WordPress plugin developers can upload their premium plugins to WP Plugins and sell them to users at their desired price. They can choose between two pricing models: offer their plugin as-is (buyers’ll have a 7 day window to download it) or offer it as a subscription, which includes upgrades and personal support from plugin’s developer for as long as you continue subscription.
More info: WPPlugins