if you have a microcenter near you (who does admittedly have a much smaller selection of TVs) they will price match online prices. For Best Buy to match I believe the price needs to be from a local competitor.
I've almost given up on shopping for high-priced items in stores. The lack of tax and lower prices at reputable online sites is just too much to pass up... Also, you don't have a 16yr old kid trying to push extended warranties or anti-virus software on you.