We normally don't post about digital movies or digital deals, but the following discounted Alien HD/4K movies on iTunes are likely as cheap as they'll get in a long time.
Alien HD: $4.99
Aliens HD: $4.99
Alien 3 HD: $4.99
Alien Resurrection HD: $4.99
Prometheus 4K Ultra HD: $4.99
Alien Covenant 4K Ultra HD: $4.99
Prometheus / Alien: Covenant Bundle: $9.98
Alien 6-Film Collection: $29.94