I'd shop Wal-Mart even if they were 20% more expensive (but don't tell them that). I hate wasting time driving around town to 5 different stores. I hate looking for parking.
At Wal-Mart I can get all the necessities (and while crowded most of the time, since it's only a mile away I go early morning and avoid the rush) without having to make 3 stops or go out of my way. They have milk at almost commissary prices (really saying something in Hawaii), toiletries, fabric, most of the crafting stuff I do, and lots of locally made Hawaii products for gifts and the like.
The convenience is worth almost whatever the store wanted to charge.
Why would you have to look for parking, I always park pretty far out and not only do I not 'look' for parking I get in a nice walk as well.