Nice app. I have a couple of suggestions:
1. Ability to navigate the shopping list by typing the first letter (like the way you move through the ingredients list)
2. Ability to hide checked items. This way, all you see on the screen are the items you need to buy. After purchasing an item, it's "hidden" from the remaining items on the list.
3. Ability to hide the Qty, Price, Aisle. In other words, be able to see more than 4 items per screen.