Don’t just walk into Best Buy and buy a TV — that is how you will over-pay 90% of the time. Instead, pick up a Sunday paper and look through the ads. Note which stores have the best prices on the TV you are looking for. It may be a Sony, an LG or a Samsung; it may be 32" or 37" — be flexible. Once you narrow down your choices, you may want to get online and look up reviews. This may help you decide that one TV is worth a little more to you over another, or that one is not worth buying at all.
Once you have your final selection, you may be able to find that TV at a competitor's store. Stores sometimes will beat a competitor’s price, so that is something to keep in mind. If you can get the TV at Sears, they usually have an incentive for you buying the TV on a Sears card; this can be upwards of 10% cash back. In that case, I would take the ad from the competitor's store to Sears and have them do a price match. Some stores give you things like Best Buy’s reward points. A single TV purchase may end up being a $40 gift card. So remember the different incentives that different stores offer, and then, if possible, price match at the most favorable store.
Also, if you don’t mind buying a TV online, you may want to check out Amazon or Ebay. Shipping can often be very reasonable, if not free, and include carrying the TV into your home and removing the packaging. Ergo, it isn’t a bad idea to run a search at these online only stores to see what you can find. Make sure the TV is being sold as new and not refurbished, as those usually come with a limited warranty — which is fine if you buy an extended warranty through Square Trade.