Hot off of enhancing the conversation system for The Dark Unknown, Goldenflame Dragon has also made a significant advancement in how the game handles conversations with merchants:

Tonight’s minor progress- when you say “BUY” to a merchant, it displays a list of things that merchant sells. Still need to improve formatting (names are ugly, costs are not yet right justified) but it’s a good start because from here it’s just a lot of tweaking.

Here’s hoping he gives us a screenshot of a merchant in conversation once he has tweaked the system to his liking.