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Under http://www.simplydiscus.com/forum/ look for Paulio and Wahter, they're both plant nuts that keep a large amount of varieties to give away and sell to up and coming hobbyists.
You could also try getting in touch with Robert at http://www.aquabotanic.com and see if he can get his hands on any.
If you are still looking for Limnobium laevigatum aka Frobgit, let me know and I should be able to send you some of this weed in couple of weeks or so.