As a new format, 4K Blu-ray commands a premium price tag, with some titles costing up to £30.
So if you're looking to start or grow your 4K collection, the current 2 for 1 deal on both Amazon and HMV is worth investigating.
Both retailers are currently offering a decent selection of discs at 2 for £30.
The titles on offer include big-hitters such as Batman vs. Superman: Dawn of Justice (opens in new tab), Mad Max: Fury Road (opens in new tab), The Amazing Spider-Man 2 (opens in new tab), the original Ghostbusters (opens in new tab) and Sicario (opens in new tab).
There are a number of titles discounted too, with Oblivion (opens in new tab) down to £13.49 on Amazon along with The Huntsman: Winter's War (opens in new tab). Each title in the original Bourne Trilogy is also down to £14.99.