The above graphic states Sky Q is no longer available to buy online.
The same graphic appears online at https://www.sky.com/tv/sky-q
Scrolling towards the bottom of the page and the Sky Stream FAQ's section seems to "suggest" that Sky Q can be still be ordered over the phone.
The bottom option, "When might I be better off with Sky Q?" in the FAQ's states
"Although Sky Stream allows you to watch the shows you love over WiFi, there may be times when Sky Q works better for you, including:
- You don't have access to the internet
- Your internet speeds falls below the suggested minimum speed
- High bandwidth usage from other devices on your network
- Your home setup limits the capabilities (e.g. thick concrete walls or interference)
If you think Sky Q is the right option for you, then please call us on 03337595262, where we'll be happy to help you make the right choice."