Of the cheaper alternatives to OpusClips, this is the one I prefer because it allows you to move a little bit when the clip starts and when it ends. I think it's vital to allow the user, a real human, to finalize the work of an AI, so editing capabilities (and I am not referring to changing the font) is essential for a professional product.
--UPDATE-- New product on AppSumo: Minvo can do all the editing you need.