Cheapest definitely needs to be available information.But context like "Downtown" would be good too. The other price book app puts the lowest price in green text, higher prices in red, so you can tell at a glance if it is the best price or not. A drop down menu of the other prices/stores, that you could view to compare or click on to switch and see where it is less may be helpful but sounds rather complicated to me. I am of course referring to unit prices- actual price is useless in real price comparison.
A list of stores is definitely needed. I shop at about 6 different food stores in the course of a month. Closest is of little concern to me. I know where the stores are located.
When I go in a store I like referring to a list of items I "usually" get in that store. Being able to associate or "favorite" items with a particular store would be great.
I currently keep a separate list of "need from somewhere or anywhere" as well. This is especially for items I have no idea where they are found or where the best price might be. Obviously you would have to be able to add items with no price or store info. (Salt Peter for making smoke balls- still haven't found that one yet.)
I love the addition of an area context, perhaps even one where the store could have more than one? Like Southside and Eastside may both have a Dollar Tree? Examples I currently use are Town, Out of Town, Southside and Northside. I have lists for each and list for inside each individual store as well.
And here is my added dream request. It seems there should be some way to add items bought (checked off of an active list) onto a pantry inventory list. At the same token there should be someway to check off used items from that pantry list to make a shopping list. Perhaps the items checked off a shopping list could be exported to the pantry list, though it would be nice if there was a way to individually turn the feature on and off if you should decide you no longer want an item at all. Perhaps a field pantry- yes/no and then quantity on hand? Further dreaming..would be if the date items were purchased were automatically associated as well and you could sort them by date- so older stuff yo may have forgotten about get used better. I would just assume the older gets used first for purposes of reasonably maintaining a pantry inventory.
A bar code scanner would be an awesome addition though sadly I only have an i-touch and unless they add cameras to them in the next update I will be unable to use that great sounding feature.