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Probably for a puffer fish right? I feel you, my puffer has an unending appetite for them! If you go to your local Petco, they sell pretty cheap plants fro one big tank and you could buy a plant and there would be snails on it. Or just ask if you can have a bag and remove them by hand. They let me do that here at my Petco.
Are you sure they weren't thinking of the nerite or mystery snails? I've never heard of them charging for pond snails ours will give us a bunch for free (clown loaches). We then set them up in a small tank and let them do their thing. You could even set them up in a bowl too