Many games have a merchant, sometimes called Pumpkin P., who shows up as the owner of Pumpkin Products. Pumpkin wears a hat that looks like the top of a pumpkin. He usually sells common items, although it's not uncommon that he'll trade you money or plans for your rare currencies. When the game doesn't support this kind of mechanic, he may appear in another financial role, such as that of a sponsor.
In Beastie Bay, Pumpkin Products sells every available item except for super alloy weapons, precious ores, the Kairobeam, grenades, dynamite, scrolls, and certain tomes. The stock is limited at first but increases as investments are made with other islands' trading funds.