Here's what Best Buy says in writing:
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Store Price Guarantee
If, within 30 days* (14 days for computers, monitors, printers and notebooks, camcorders, digital cameras and radar detectors) of your purchase from Best Buy, you find a local competitor (excluding Internet competitors) offering a lower price on an available product of the same brand and model, we'll refund the difference plus another 10% of the difference. Just bring us a current ad or other verifiable written proof of the lower price, plus your original Best Buy sales receipt to claim your refund. This offer good only on all new in-the-box products of the same brand and model that are available in-store at any other local authorized retailer. It does not apply to competitor's one-of-a-kind or other limited quantity offer, or when a bonus or free offer (such as special financing program or manufacturer's rebate) is included in the purchase. Offer does not apply to BestBuy.com pricing. All returns exchanges and price adjustments must be made in the country of original purchase. Go to the customer service counter for details.
*In California, excludes cellular, digital and PCS phones and pagers.
Online Price Guarantee
At this time, we do not have a price match guarantee. However, if you purchase an item online or at a store kiosk and choose store pick up, and the item is offered at a lower price when you pick it up, you will be charged the lower price.
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Hope that helps.