Lol, yes they can be quite destructive and frustrating! Good luck with your transition.Yes i can imagine eartheaters can destroy plants rooted at the bottom Ibwill keep you updated as I would like to eventually switch to all natural plants!
Regarding where to buy plants, Local aquarium clubs usually have nice plants for low prices at meetings. And you see the plants before buying, you're not paying for shipping or worrying about plants freezing during transit
plantedtank.net has a fs/ft thread http://www.plantedtank.net/forums/forumdisplay.php?f=153&order=desc&page=2 Lots of info there on plant species/requirements too
LiveAquaria http://www.liveaquaria.com/product/aquarium-fish-supplies.cfm?c=768+1632 looks like they have egeria densa too
http://dustinsfishtanks.com/shop/ At times, he's more $, but subscribers get notices on sales
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