mp_weapons_allow_typecount <count>
Determines how many purchases of each weapon type are allowed per player per round. Pass 0 to disallow purchasing, -1 to have no limit.
It is useful for all sorts of warmup configs where you want players to be able to buy any weapon however many times they want without forcing them to use the give command.
Examples
mp_weapons_allow_typecount 5 - Each player can buy the same weapon (e.g. AWP) up to 5 times per round (default).
mp_weapons_allow_typecount -1 - Each player can buy the same weapon an infinite amount of times per round.