Personalized shops. For example, allow a smith to make a variety of different kinds of armor.
A smith would have a list of items he can craft, such as leg plates, helmets, breastplates, etc. Each item would have a base cost. Then you would choose a material such as brass, steel, etc. Then you would choose an adjective for the armor. Once it was all done, you could then buy the item at its total cost.
Here's an example.
Code:
The blacksmith says 'I can forge the following items:'
A helmet - 1 platinum
A cuirass - 1 platinum, 5 gold
A set of leg plates 1 platinum, 4 gold
You say 'I would like a helmet.'
The blacksmith says 'I can create a helmet in the following materials:'
Brass - 5 gold
Steel - 1 platinum
Tanso steel - 1 platinum, 7 gold, 5 silver
You say 'Tanso steel.'
The blacksmith says 'I offer the following designs:'
None - No charge
Glistening - 5 gold
Riveted - 5 gold
Engraved - 6 gold
You say 'Glistening, please.
The blacksmith says 'I shall begin work on it right away.'
<a tick passes>
The blacksmith says 'Your piece is finished.'
>list
The blacksmiths says 'I offer the following wares:'
A glistening tanso steel helmet - 3 platinum, 2 gold, 5 silver
EDIT: Of course he would craft each item specifically to the buyer's size.