Merchandise Below Market Value
Question
Where I live (and in many other places), it is not unusual for people to sell merchandise that is highly in demand on the streets for a small fraction of the price the identical goods are customarily sold for in a retail store. I have no proof that any of these vendors have stolen their wares, only the ‘too good to be true’ suspicion on the basis that there is no way I know of to obtain this merchandise for such a low price. Even retailers pay more from wholesalers than these vendors are selling these items for. What is the Halacha when it comes to buying from these street vendors?