If no one responds... you can try getting some from Green Chapter, their tanks usually have frogbits and if you buy fishes or shrimps from them, just ask for a few to "accompany" the livestock home.
Note that the size of frogbits depends on where they are grown, the ones grown in ponds with direct sunlight and lots of nutrients are usually really large, up to the size of a palm, while the ones in aquariums tend to be much smaller like 20 cent coin size.
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