Any sites anybody knows for small fountain ponds?
Answers:
Water plants need water and I don't think they'll go thru the mail and survive. Check out your local nurseries and make a few phone calls to find out if any of the nurseries sell aquatic plants. Where I live I have to drive an hour to find a nursery that carries aquatic plants. The nursery people bag them up in triple plastic bags, filled with water!
This site carries water plants and you could read about them: How to root jasmine vine?