Is there any single website which lets shoppers find the lowest prices online? Online price-comparisons websites can be a handy resource when it comes to finding the best deal on products you buy on the internet. However there are some factors limiting their ability to always find the best prices. 

Finding the lowest price means taking factors like shipping charges and coupons into account. A great price with a ripoff shipping charge is’nt that great of a deal after-all. Some of the top comparison sites (i.e. pricegrabber.com) let you compare shipping charges across merchants. However, there’s no way for a price comparison site to find every Kohl’s Promotion Code or ‘free shipping over $50′ offer and factor that into the final price.