The 24 hour stores will allow you to enter the stores at any time, they form line sfor the big ticket items and all other items are on flats wrapped in celophane and surrounded by employees until the designated time for the sale to start,(at least, that's how they do it here in az) they then rip open the pallets and chaos erupts. The nice thing is, if there are specific items you want and you have a team, you can split up and ensure that you;ll get what you're there for, rather than hitting the door and sprinting to figure out where everything is located. I usually arrive at the store around 2-3am to scope it all out and pick a position... I always hit walmart first, becasue it's the quickest and easiest to plan for....Happy shopping!