Whenever you are about to buy something, it is always better to do a comparison of the price for that product across different retailers. It is highly possible that there might be a promotion going on somewhere This is that extra step you take for spending the right amount for the product you are purchasing.
Also, we now have a section on 'Review sites' where you get the product and store reviews from previous buyers. Based on these reviews, you can decide whether to go for that particular product or not. Brand name and Quality are two different things, though astonishingly, are treated to be the same by most.
Everyprice.com is a website which figures prominently in google search results but in my experience, some of the websites in its results do not have any good reviews at all. So, if I were you, I would do more research before buying something from the stores everyprice.com suggests. I listed it on this page only because I wanted you to know that I didn't miss it out and already know about it but would be wary about the results from its comparison results.