[qazwsx]

Yes, Of course, It could be added like this.

Code:

if(listitem == 0)
{
if(GetPlayerMoney(playerid)>1000)
{
SendClientMessage(playerid, COLOR_WHITE, "You Have Bought 390 of Shotgun Ammo);
GivePlayerWeapon(playerid, 25, 390);
GivePlayerMoney(playerid, -1000); // 1000 is the price of shotgun. You can change it
}
else()
{
SendClientMessage(playerid, COLOR_WHITE, "You Dont Have Enough Money");
}
}