Sometimes Auto-responders or Autobots have problems picking up certain characters. Have you ever scanned a WORD document and had some of the words go screwy? Same principle. If a person is typing he/she is keyed in on what it is and what it costs, so you would usually see item name and reference to cost.
Weird that it was an internal pm. But I would believe anything these days-They have figured out to attache spyware to a person's myspace pics, and I am just waiting for some creep to find a way to attach spyware to Ebay listing pics-to hack into your account.
I'd walk away from this one.
Later.