Up until now I've just lurked, but wanted to chime in about Best Buy and hopefully offer some hope to those still waiting. I was able to order a Z9 from their site today for delivery in 2-3 weeks. They had availability on and off today for a few hours (1PM - 4:30PM PST). The first few times I tried to order it wouldn't go through and returned a generic error. The camera would then go out of stock. It came back in stock 3-4 more times within the next couple of hours and eventually I was able to complete the order.
My advice is to keep trying and use a browser extension to track their stock. I had mine set to check every two minutes; it also helps that I'm online most of the day.
For those that may not be aware BB has a 15 day return window on this camera and a 15% restocking fee. I wouldn't order from them unless you fully intend on keeping it or you don't mind reselling it to recoup.
I understand the skepticism so here's a screen grab of my email. Good luck to the OP in getting one soon.
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