Changing the sale values ​​of items

[Kincy]

Hello dear friends of rAthena, I have a question, how do I edit the values in (zeny) of the sale of all items in the NPC.

For example, I'd like to make items that would be worth 200,000 zeny on the NPC start being worth 300 zeny.

[Emistry]

if the shop is reading the buy/sell (default) value from item_db, then edit the item_db info

#   Buy                     Buying price. When not specified, becomes double the sell price. (Default: 0)
#   Sell                    Selling price. When not specified, becomes half the buy price. (Default: 0)

if the shop is readying the buy/sell value from the npc script, then edit the amount in the npc script

if its value is -1, meant it read the default value from item_db