In search of uncrummy duckweed

[disco.critter]

Hello! My goldfish have delighted in eating all the frogbit I got them in a span of four days. So I'm looking to upgrade to duckweed for my three 2 inch fantails.

But I don't want duckweed full of aquarium snails, but I also don't want to go rogue in nature. Suggestions on where to go? I live in Eastern Massachusetts but would consider buying through the mail from a reputable seller. Thanks for any leads or ideas!

[ADsnail]

I've had good luck on ebay, especially with a Texas seller called marcusfishtanks. Not sure if he has duckweed, but if not he's very helpful about what else would work for you. Others on ebay do sell it, a few even say "snail free".