If you need hundreds of images, and animations, you might try these:
Use this to animate them:
Or Blender and free googled Motion capture files for the animating.
Blender is great for making object renderings too. Just google Free 3D models, and you can render thousands of free 3d items. You can find all sorts of RPG stuff for free.
If you use a 3D render engine like Blender, making Isometric games is REALLY easy.
It might save you a little bit of money.