Sprint's original announcement said that today would be the big day—you'd be able to wander into a Sprint store on November 14th and buy a Nexus 6. Well, it's not clear exactly what's going on. Sprint has put the Nexus 6 up on its website, but there's no firm ship date.
The device will run you $696 if purchased up front, but you can also do a 2-year contract for $299 or make monthly payments of $29 for 24 months. Sprint is only selling the blue version of the phone with 32GB of storage. If you want white or 64GB, you'll have to go elsewhere.
Those who have ordered the phone are reporting that Sprint's system is sending out an automated backorder email shortly thereafter. Sprint's website really doesn't make this clear, though. So, your pre-order will be acknowledged, but you're still going to have to wait a few days to get the phone. In-store availability is unclear, but seems questionable.