Would shopobot helpful to analyze the true price?

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So, you might shop at those stores from time to time, especially those electronic stores, when they promote their electronic items in discounted price. How would you know they are truly mean to be real price that you pay for under the market force? Someone told me that, on the dealnews.com, where you can find all sort of products with their real market price and a comparable discounted price on certain occasion. Lately, I found another website which is useful in comparison to dealnews.com. Shopobot is a great site to analyze the electronic products in the market with their true prices. So, you can check both of them if you want make a shopping. Because sometimes, you might get rip - off from those stores or online deals.