Index: conf/battle/items.conf
===================================================================
--- conf/battle/items.conf	(revision 14697)
+++ conf/battle/items.conf	(working copy)
@@ -22,11 +22,11 @@
 //--------------------------------------------------------------
 
 // The highest value at which an item can be sold via the merchant vend skill. (in zeny)
-vending_max_value: 1000000000
+vending_max_value: 30000
 
 // Whether to allow buying from vending chars that are at their max. zeny limit.
 // If set to yes, the rest of the zeny above the char's capacity will disappear.
-vending_over_max: yes
+vending_over_max: no
 
 // Tax to apply to all vending transactions (eg: 10000 = 100%, 50 = 0.50%)
 // When a tax is applied, the item's full price is charged to the buyer, but
Index: src/map/vending.c
===================================================================
--- src/map/vending.c	(revision 14697)
+++ src/map/vending.c	(working copy)
@@ -73,7 +73,9 @@
 void vending_purchasereq(struct map_session_data* sd, int aid, int uid, const uint8* data, int count)
 {
 	int i, j, cursor, w, new_ = 0, blank, vend_list[MAX_VENDING];
-	double z;
+	double z,price_buffer=0.;
+	int currid,cost,vcurrid,new_currency = 677; //Change 677 to the Item ID of whatever you use as currency. 
+	struct item item_buffer;
 	struct s_vending vending[MAX_VENDING]; // against duplicate packets
 	struct map_session_data* vsd = map_id2sd(aid);
 
@@ -119,13 +121,15 @@
 		else
 			vend_list[i] = j;
 
-		z += ((double)vsd->vending[j].value * (double)amount);
-		if( z > (double)sd->status.zeny || z < 0. || z > (double)MAX_ZENY )
+		price_buffer += (((double)vsd->vending[j].value * (double)amount));
+		currid = pc_search_inventory (sd, new_currency);
+		if( price_buffer > (double)sd->status.inventory[currid].amount || currid < 0. || price_buffer > (double)MAX_ZENY )
 		{
 			clif_buyvending(sd, idx, amount, 1); // you don't have enough zeny
 			return;
 		}
-		if( z + (double)vsd->status.zeny > (double)MAX_ZENY && !battle_config.vending_over_max )
+		vcurrid = pc_search_inventory (vsd, new_currency);
+		if( price_buffer + (double) vsd->status.inventory[vcurrid].amount > MAX_AMOUNT && !battle_config.vending_over_max )
 		{
 			clif_buyvending(sd, idx, vsd->vending[j].amount, 4); // too much zeny = overflow
 			return;
@@ -170,10 +174,14 @@
 	if( log_config.zeny > 0 )
 		log_zeny(vsd, "V", sd, (int)z);
 
-	pc_payzeny(sd, (int)z);
-	if( battle_config.vending_tax )
-		z -= z * (battle_config.vending_tax/10000.);
-	pc_getzeny(vsd, (int)z);
+	if(price_buffer > sd->status.inventory[currid].amount)
+		return;
+	cost = (int) price_buffer;
+	pc_delitem(sd, currid, cost, 0, 0);
+	memset(&item_buffer,0,sizeof(item_buffer));
+	item_buffer.nameid = new_currency;
+	item_buffer.identify = 1;
+	pc_additem(vsd,&item_buffer,cost);
 
 	for( i = 0; i < count; i++ )
 	{