Sometimes. And then I have to find a salesman, show them the price, argue them into it (as they try to claim they only price match brick and mortar), and deal with their hard sales and trying to talk me into buying a warranty. I'd rather just buy it on Amazon and not deal with their salesmen. Unless I absolutely want it today I'm not even going to ask them to match.
In regards to Best Buy, I've had no problem price matching to major online stores (i.e. Amazon, Newegg, etc.) and I've had no problems with someone trying to talk me into a warranty (They ask at the register if I want the warranty, I say No, they complete my transaction). Of course, when I buy from Best Buy, I usually buy it online from BestBuy.com for pickup and then just go and pick it up. Why spend time in the store "browsing" if you don't have to?
The one reason why I still buy some electronics from the Best Buy retail store is for returns. It's a lot easier to return a 65" TV or an A/V AMP to a retail outlet than it is to ship it back to Amazon, etc. Yes, the online outlets have services that do pickup/delivery but I prefer to deal with retail outlet for these items.