Instead of checking the price, I check on the reviews for the product while I am in store, especially if that product is something I am not familiar with. Recently I went to shop for a compact camera with no particular brand in mind, I went to the shop, checked out what's on offer, and read the reviews on the spot via my iPhone. This process helped me to weed out a few cameras, and finally I got a camera (Canon Ixus 130) at a price that I am happy with. Since I already know the pros and cons of this camera, I must say I am quite happy with my purchase as it removes a lot of uncertainty from the purchase (No, AFAIK, most shops in Singapore don't provide refund or exchange for purchases...)