I was in my local Walmart tonight and noticed they had 3 boxes of the 100 ct Federal .223's. They require you pay for ammo at the Sporting Goods register....I had something else I wanted to pick-up and didn't want to write 2 checks so I went to get my other item. I wasn't gone but a few minutes, and some guy had already bought 2 of the boxes and would have bought the 3rd box but didn't have enough cash on him to cover all his other items. So I was able to get a box of the ammo after all. If the ammo you want is one of the popular items like the .223 bulk packs.. better get it whenever you can find it, because there are lots of other people out looking for and stocking up on the same calibers right now.