Shopping Lists are separate
I use a separate app and structure for shopping lists. But whenever I have an item that I really need to get I add Stop at :insert store name: see list in :app: and the context is the town where the store is.
So for example I have on my list right now
Go to Hobby Lobby see list in SplashShopper with a context of Delta & GJ. Next time I am in those towns I'll see it on my list to stop and when I am in the store I know to check my separate list of stuff to buy.
Oogie McGuire - Mac, iPhone & Omnifocus
OogieM on Twitter
Paonia, CO USA