In the DS version it isn't possible to obtain the Gringham Whip until Chapter 6 as the Immigrant Town can't be completed until that chapter. In the DS remake, the number of medals and prizes earned was changed to follow the system used in more recent Dragon Quest games: A player could get more than one of the same prize offered by the medal king however, in order to get the best prize the player could not buy any other prize, as it cost 32 medals.
In the NES version, a total of 32 medals could be found, which were used as a separate currency for the prizes offered by the medal king. In Dragon Quest IV, mini medals are collected by a king who lives in Minikin's Dominion. They are collected by a man living in the well in Aliahan.
Mini medals only appear in remake versions.