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Are there any third party widgets or alike i can add to sell ad space on my website?

Im still under construction and all that and it is going well (so far, knock on wood) and while i know i have to export this project for conversion to wordpress or other host with unlimited CMS items. I was wondering if anyone knows any open source or reasonably priced widgets or alike that help me with selling ad space. Such as banners, and before video ads which this site is going to host through a 3rd party CDN