The cutoff aligned with when they launched the DirecTV via Internet product. They removed the option to order hardware from new stream only BYOD accounts. That said, if you can find a used one, or want to pay retailer prices for a new one (solid signal $199 is the only one I know of, which is really high since retail is $120). If you get used keep in mind there is a slight change DirecTV could disable it if someone signed up under contract, didn't pay, and didn't return the device. No reports of that but it happens all the time with cell phones. Also make sure your seller has turned off auto-sign-in so you can login with your account. I've only seen a few show up on eBay but there has been a few out there. Might be best to get an Osprey box for under $50 and check back in a year when DirecTV starts trying to move refurbs cheaper.
I own several osprey/gemini boxes.
I would like to purchase a gemini air for use in my vehicle while traveling.
I tested using a hotspot from my cell this am and it works perfectly. No reason it shouldn't work while going down the road.