Go to wServer then realm then entities then merchant and finnaly MerchantLists.cs. Here's a line from one of mine:
So if you wanted to make it gold and cost 500 of it you would replaceCode:{0xa6b, new Tuple<int, CurrencyType>(175, CurrencyType.Fame)}, //Golden Helm T5WithCode:175, CurrencyType.FameIf you wanted it to be a custom item you would simply replace 0xa6b with the id of your custom item, hope this helps.Code:500, CurrencyType.Gold