Will Cyber Week help me in buying my favorite products at discounted prices?

Best prices are not always found on the internet. However, many retail stores now match internet prices, and some even guarantee low price for 30 days.
I just recently looked for a new computer, and found a couple that looked good, an HP and a DELL.
I went to BestBuy to look at them, and told the sales rep I was interested in the DELL (23.8" screen, all in one) for $429 on sale from $500. He said a customer just returned one, and the open box one will sell for $330 with 11 months warranty, so that's the one I purchased.
I love it.