Lemna minor (Duckweed)
Salvinia minima (Water Fern/Water Spangles)
Free! Pick up in Portland (ME).
The floating plants in my tank have grown to the point that I need to cull some and I'd rather give them away than compost them. I have bladder snails so there may be hitchhikers. Neither of these are listed as invasives, but as always be a good steward and make sure the plants stay in your tank and out of our natural waterways.
If anybody wants to trade, I'm looking for Malaysian Trumpet Snails
Edit: Still composting handfuls on a regular basis!