Kermit eggplants

Has anyone ever seen seedlings for sale of these small, round, green eggplants? I began starting some seed, but just got busy and wasn't able to see them through. I kept an eye out for started seedlings, but in my browsing around the northeastern US, I've yet to see any for sale. The only seeds I've seen come from Johnny's in Maine -- is there some kind of proprietary breed issue at work?

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