I have DirecTV Stream account - how do I get a DTV Stream Box

Try this...

On the website...

• Sign In
• Click on Account Overview (at the top left of the screen)
• Click on My Streaming Devices - Manage (hopefully that option is there for your)
• Look for the button "+ADD A DEVICE"

How long have you been a subscriber?  If you are a recent subscriber (you subscribed to DirecTV Stream) the above instructions should work. 

If you are a (very) long term subscriber - dating back to DirecTV Now or AT&T TV Now - then you apparently can't.  For some reason they won't sell Ospreys to those subscribers.  You can get them on eBay, but there is some risk to that, as some sellers apparently neglect to properly unregister their devices before selling them, and that makes them unusable.