Thursday night was the only night I saw anything online and was able to reserve one. I was on my computer at the time. I've since tried on my computer, phone & ipad on all other nights to reserve another one. It's not you or your computer. It's the stock. They must really be supply constrained, at least for AT&T versions.
Thanks for the reply! At least I know it's not just me! I feel like a ridiculous fool for doing it every night.