This is a fun tool, and as soon as I wake up my brain starts thinking about it :D
AnimateDiff is an extension within Stable Diffusion, and all you need to do is check a box to install it. So it's free. You do need access to one of the Stable Diffusion UIs (A1111, Google Colab, or Comfy UI) and computer with enough pony power to run. I found some youtube videos that walk you through the installation. I hope you're able to play with it because it's fantastic.