The 4K home release of "Oppenheimer" is in demand and facing supply shortages, but select retailers like Walmart and Barnes and Noble have copies in stock right now.
A few words about™ - Oppenheimer -- in 4k UHD • Home Theater Forum
When is the Oppenheimer streaming, Blu-ray and DVD release date? - Mirror Online
Oppenheimer release of the YEAR? : r/4kbluray
4K Release for Oppenheimer : r/4kbluray
Oppenheimer Blu-ray (Blu-ray + DVD + Digital HD)
The 4k Blu Ray of Oppenheimer doubled the sales of the regular 1080p Blu Ray : r/4kbluray
Oppenheimer [4K UHD + Blu-ray] : Cillian Murphy, Emily Blunt, Robert Downey, Jr, Matt Damon, Christopher Nolan: Movies & TV
Oppenheimer Walmart Icon Edition arrived today! : r/4kbluray
All Quiet on The Western Front (Collector's Edition) - 4K