CompUSA customer service varies from great to crap, it depends on the employee. I have made purchases where they'll price-match online, or with a phone call, to 'don't forget your rebate!.'
Then, there's a few times where the moron won't even bother scanning the item for a price check and just says, 'It's whatever the sticker says, even if it's wrong, I'll have to charge you the higher price.'