Make it so that customers will ask for a certain weapon variety like a dagger pole or hammer pole and so that every different sword/hammer/pole variety costs more or less depending on who asks for it.
Also, what about adding customers who already have armor and swords? you keep seeing them in the background but the only one's who asks have nothing, would be cool to see actual adventurers come and order from you. Maybe add so that the more you play, the more experienced and popular warriors comes.