i know idk what happened but anyway this was what i was tring to say
if you use seose go to note pad and open NPC is data
[npc22] monster id
{
[vocal] chance=10 {what he says}
[shop] Item=2 Sell=10 item=2 is the id sell=10 is how much its selling
[shop] item=5 buy=10 the NPC will buy this item for 10g
for the item=2 sell=10 you dont need buy= becuase it automaticly buys it back half price
once again im not too good with guides so i hope this helps :o