Is it really worth it?

I have found a store that sells produce at a better price than Wal-Mart. Since we have started eating more produce, it seems pretty necessary to go to this other store for said produce, but then I have to go to Wal-Mart for everything else. Today, I realized that Kroger brand stuff is sometimes cheaper than Wal-Mart brand stuff. So now the question is, do I go to three stores to get all my food stuff or do I just figure it's not that big of a deal? Sure, I'll save a few dollars but taking my 5 children to 3 grocery stores in one day seems a little much, and really isn't much fun for anyone. You might say I could do it on different days but that would cost more in gas, therefore canceling out the money I would save.