So here is the idea.. Once a certain level is reached within Forgotten Tales, your call (level 50 maybe), you have the option to purchase a game add-on for XXXXX Gold (10,000,000 gold maybe). The game add-on would give the player the ability to access a merchant from ANYWHERE within the game via a new icon as shown in the example image below.
EXAMPLE SCREEN SHOT - Notice the Shopping Cart Icon
Now, with all good things there are drawbacks to using the merchant.
1. Only the items from previously "visited" merchants appear in your traveling merchant store. You haven't visited the merchant in the 200 gold city then their wares are not displayed.
2. All items you sell to the merchant are sold back at a 50% deduction in price as a penalty to using the merchant.
3. All items sold via the traveling merchant demand a 50% increase in price due to the ease of purchasing potions, etc.. (shipping of items in FT is a bear!)

As always... Your humble FT player.