Besides the ones listed on the Sticky's......
Apparently at least one of the pet stores here say it's hard to find Anacharis....and another store says they barely have them in stock because they either sell out really fast or the stored doesn't order it often. They supposedly don't have Water Lily but they have Red Tiger Lily, they don't have duckweed, and haven't even heard of hornwort.
So...I was just wondering if there was any other kind?