Grabbed this from BestBuy.com, looks to me like there IS something saying price match and the GC offer cannot combine.
The Guarantee is limited to one price match per identical item, per guest and does not apply to: Contract mobile phone devices and plans, the online prices of retailers not listed, the online prices of third party vendors (Marketplace vendors) on designated major online retailers websites,post purchase price match requests to competitor's prices, Best Buy for Business™, offers that include financing, gift card offers, bundling of items, free items, pricing errors, mail-in offers, coupon offers, competitors' service prices, items that are advertised as limited-quantity, out of stock, open-box, clearance, refurbished/used items, our and our competitor's Deal of the Day, daily deals, special hour sale event items and credit card offers, BestBuy.com Clearance & More and Marketplace items, and items for sale Thanksgiving Day through the Monday after Thanksgiving.
Unless I'm missing something? I'm still gonna try today after work anyways.
The Super Awesum CAG Crew: killer9, blissskr, advanced, GenPirate, DarkRider23, rickyff7, LegendK7ll3r, and whoever I missed.