Water Lilies

I am looking for a reasonably priced source for water lilies and aquarium plants.  I would like to start some small water gardens in the back yard but the prices of water lilies here on Oahu are a little too steep.  Prices range from about $20.00 to $60.00.  I'm not looking for rare or exotic lilies __ just something to enjoy after a long workday.

I'll appreciate any informtion you can send.  Thank you.