Using 0.4 source pack, like Fir3element/3777
Should be possible to make when you buy stuff on NPC, like:
<parameter key="shop_buyable" value="jagged sword,8602,300;steel axe,8601,300;daramanian mace,2439,300;crimson sword,7385,3000;barbarian axe,2429,3000;clerical mace,2423,3000" />...