chansam - I was just letting you know, just in case you were counting on making $1000 on this deal (as evidenced by your Pentium IV comment). A $275 profit to run, package, and ship-out eleven (11) separate auction orders could end-up being a lot more hassle than it seems like.
BTW, a general rule-of-thumb about "too good to be true" deals - DO NOT CALL customer service!!!! That usually has the effect of killing the deal. As Nutzo said, leave that to the credit card company. If you have the proof that the items were sold to you at "Buy one, get one free" for $139+, but Buy.com turns around and only ships you six and charges you for all six, your credit card company will force buy.com to honor their mistake regardless of their "pricing mistake" disclaimer - if it ships. Once the item ships, Buy.com is legally obligated to sell the items at the contractual price they initially offered when they charged your credit card. Hence why you NEVER CALL ! ! ! !