Per Apple's press release:
Available today from Apple.com and will start delivering to customers and arriving at Apple Stores, Apple Authorized Resellers and select carriers next week.
AirPods will be shipping in limited quantities at launch and customers are encouraged to check online for updates on availability and estimated delivery dates. Stores will receive regular AirPod shipments.
This is great news. While I reviewed the iPhone 7 Plus in October, I sorely missed not being able to report on AirPods. It felt like I was missing something—quite literally. I'm extremely excited for their potential as an accessibility tool, and will get a pair as soon as I can.