Fresh catnip and dog pee... not sure if that would sell as a scented toy though. Would require a creative ad campaign, or a snake oil salesman in the Bill Clinton genre. But that does remind me that since we have reached the end of the growing season, I need to 'put up' some catnip for winter, since we won't have any livegreen until next globul warmthing cycle more or less next April...
We haven’t succeeded in growing catnip, but we got a big jar at Petsmart, and Jake says it still smells good. Sometimes I have to catch myself before I put it in soup, instead of oregano.