Addictive tips.com
Product Chart is an interactive app that updates live as you change your selection criteria for the device you’re interested in buying. The devices and their prices are taken from Amazon where the product can be purchased. We tested the app out with laptops and you can see in the screenshot below that the offerings are rich. The laptops are listed on two axis with screen-size on the y-axis and price on the x-axis.
It appears to scrape data from Amazon. Selection seems rather limited too (especially for smartphones), but worth a look if you're hunting after a certain laptop with certain specifications.