There is no one specific number I can give you. It all depends on your individual needs and wants.
Costs are based on several factors including the process, illustration style, level of animation, and the length of your video.
Video production consists of several steps including the research phase, script, storyboard, style frames, voiceover, animation and finally, sound design.
Depending on the level of complexity, videos can range from $5K-$50K+.
For an estimate, email me and let me know a bit about your project. If you can include a reference video you like, as well as the approximate length you have in mind, I can get you an estimate very quickly.