Allows you to use the /buy command to buy items from a vendor. Can be used to circumvent the limitation of certain vendors (Blood of Sargeras vendor) which prevents you from buying multiple items.
example usage:
/buy star<br />/buy star,2 /buy starlight rose /buy Starlight Rose, 60
selects an item whose prefix matches your query, but only if no other item matches your query (e.g. "/buy s" will probably fail).