Might not be a fib. I could have sworn that the price match excludes certain dates around Black Friday. I had experience with this last year, when I found something for $20 less, the day after BF. might be wrong about this, as I haven't read into any of the price match details this season.
EDIT: Found on Best Buys Price Match Guarantee page
"Buy It Now with Confidence
The Guarantee does not apply to: Our competitors' website prices, offers that include financing, bundling of items, free items, pricing errors, mail-in offers, competitors' service prices, items that are advertised as limited-quantity, out of stock, open-box, clearance, refurbished/used items, Deal of the Day items, BestBuy.com Midnight Sale and special hour sale events, BestBuy.com Clearance & More and Marketplace items, and items for sale Thanksgiving Day through the Monday after Thanksgiving."