I have been looking to upgrade to the UHD box from a standard Sky Q box. This is priced at £99 through the shop section in the menu for both the 1tb and 2tb boxes.
Then reduces to £50 at checkout.
2tb, UHD, Netflix Ultra and 2 month UHD package for £50. Very happy with that.
Hopefully works for everyone.
I'm a Gold VIP member so that may affect price.
Make sure you click option for NO new contract.