I'm not sure if you can save up and buy later, but I do know we sold out of our stock of 30 before I even got there at 2:00 so I don't know how many places will even have leftovers after it's all said and done. Yeah, I stopped in at the Walgreens by my house (one of about 12 within a five mile radius) around 1:15 and there were only two or three left. And the guy said that was it. There's some sort of make up coupon on certain days but I'm not sure how that's handled.