I feel your pain on this one.
I have a hard time shopping during the week, being a mommy to a toddler, prego and not driving puts a damper on it. Since the grocery sales start Weds I don't get to them right away because that's hubby's Bible study night, and Sunday mornings we are at church.
I try to make sure I NEVER go to the store for one thing. Usually Walgreens is okay for me, but Albertsons runs out of things SO fast. It seems so silly to have a sale on something then not have that item only halfway into the sale!
I know at one grocery store when my sister went in to get 40 lbs (YES 40!) of hamburger that was on sale, with the sale ending that night they agreed to let her have the price on it the next day, but only because she had wanted so much all at once. She has a family of 8 so they have to REALLY shop!