[Nekrus2]

pawn Код:

if(listitem == 0)
            {
                if(GetPlayerMoney(playerid) <= 2000)
{
                GivePlayerWeapon(playerid,22, 500);
                TogglePlayerControllable(playerid,1);
                GivePlayerMoney(playerid,-2000);
}
else
{
SendClientMessage(playerid, COLOR_BRIGHTRED, "Not enough money to buy this weapon");
}
            }

try this
(thats just for 1 item make for others youself )