Merchants of level 6 and higher can buy more than one item at a time from a special store.
The syntax to use is:
buy [amount of items] [number of item/name of item]
buy 10 1 - you buy 10 pieces of item 1 buy 10 medkit - you buy 10 medkits
The amount of items to buy cannot exceed 20. The more items that are bought at a time the more discount the merchant gets. There is no skill check for the use of this ability.
This feature is usable with smugglers' advanced haggle.