What I need

What I need is a barcode scanner for my phone. Then I could check my own prices on stuff as I shop or even better, I could shop in a catalog by simply scanning a bar code with my phone, which would then allow me to pay for my order via another application on my phone, which would then allow me to complete birthday and holiday shopping while on the go. The app could have my shipping and payment information stored on my phone so when I completed my order, I would only have to enter a password of some type and walla! Order placed, completed and on its way to me.