משנה על סוכה 3:1

Produce of the seventh year may not be sold by measure, weight or number. Neither may figs [be sold] by number, nor vegetables by weight. Bet Shammai says: they may not be sold, even in bundles. But Bet Hillel says: that which is usually tied in bundles [to bring] to the house may even be tied into bundles for the market, such as leeks and netz hahalav.