I think I'm going to try and walk in to my local Verizon store and buy one on Friday. I feel like people always sleep on carrier stores when these phones release. Verizon rep said they would definitely have walk-in stock but he wasn't sure how much (couldn't say the exact amount if he did know!).
He said to get there an hour before opening but I may come earlier than that. This Verizon store is three blocks away from an Apple Store and I feel like people will head to Apple instinctively and forget about Verizon.