I’m on my phone posting this, actually.

I was looking for a barcode scanner application and found pricepad instead. It is a free app that allows you to save information about items you want to buy to your phone.
You can save name, price, barcode number, genre of item, and personal notes. Then when you are looking at the same item later, you can search through your saved items.

I am going to give it a try for grocery shopping, starting by putting the items from the circulars in first.