Buy

While there is no "help buy," (with the comma) as is displayed in the commands list, there is a help file for "buy" (without the comma).

From "help buy:"

Buy usage:

  buy <specifics item keyword(s)>, <seller name>
  buy, <seller name>

Example:

  -> buy, raash (buy everything from Raash)
  -> buy all, guard (buy everything from guard)
  -> buy all.swo black, raash (buy matching items only)
  -> buy swo black dwar, raash (buy matching item only)