Just noticed Home Depot Online is carrying a large variety of pond products, including plants. Not an endorsement, just saying.
http://t.homedepot.com/b/N-5yc1v/Ntk-All/Ntt-Pond?currentPLP=true&Ns=None
http://t.homedepot.com/b/N-5yc1v/Ntk-All/Ntt-Pond?currentPLP=true&Ns=None