I have found that the reagent vendors will usually give you slightly more for the things that the Bazaar is already full on, like Deep Mushrooms or Red Mandrake or Ore. Instead of 1 gold, you can get 4, IT SAYS. However, instead of paying you the four or three gold, it gives you one less gold per item. When I was selling deep mushrooms for 3 gold, my gold counter would only increase by 2. This has continued to happen on several occasions.