A water plant co-op. Which by the way is super easy. In the past, Texas Waterlilies just gives us a great price on a selection of their plants that they chose, they collect the money, and they ship the plants. We just need someone to contact them if there is enough interest to see if they will give us the discount rate and they will say yay or nay and give us a starting date and deadline of when we can order to get the co-op rates, as well as a list and co-op prices.
I highly recommend this water plant nursery!
http://texaswaterlilies.com/