Just keep in mind that pricewatch doesn't sell anything. They only find the people that do and list them in order of who has the cheapest price including the shipping.
Also don't forget about
http://www.newegg.com
They might always have the cheapest price for the product, but they always use FedEx shipping and at cheap prices and it's really fast.
Plus on many of their products they have extra deals; free t-shirt or sticker, $# off of something go with what you're buying like $5-10 off CDRs or DVDRs as the case maybe.