My lfs has it in a display tank, but they are going to tear it down. THe owner told me that he'll give me some since I've always been bugging him about it. I'll see how much I get, and if there's enough, I might send you a small piece. That's if you don't find anybody else with it, by then.
Dave, I wish you would have mentioned that before I had sent the box of plants out for you. Right now I have promised it to someone else but as soon as it grows back I'll let you know. Unfortunately it's such a slow grower...
BTW, I've seen it at Pet Smart recently so check your lfs, they may be able to order some for you. If possible, get some that is already growing submerged, moving this plant from emersed to submerged seems to be a little harder than many other plants.
Good luck, if all else fails, remind in a month or so.
I'm in NE Philadelphia. The Pet Smart that had lobelia is the new one on Rosevelt Blvd, just after the nabisco factory. It's a rare thing to find however, but if they had it it means they can get more, you may need to sweet talk someone in the store as they are pretty bad about ordering things for people there.