2D Animation Software

This is probably a long shot, but there is a lot of knowledge here so I thought I would ask:
Can anyone recommend an easy, inexpensive piece of software that can create 2D animation, as in cartoons? Any input appreciated, thanks.

The latest release of Sketchbook Pro can do animation. I’ve played with it a little and it seems decent for simple animated sketches, but I don’t have any experience with others to compare it to. I have done animations in Flash, but that’s a whole different style (not really for drawings, though you could import them I guess, more movement of shapes) and more expensive.

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Also adobe illustrator himself can manage animations. But I suppose a dedicate software should/could be better at it.
Just my two cents

Thanks for the input, I will check out Anime Studio.