DigitalWorldHD.com has A Quiet Place iTunes 4K Digital Code on sale for $3.95. I just purchased using PayPal and got the code and it worked perfectly. They also have the UltraViolet HD version (Non-iTunes, Non-4K) for $3.95 as well.
iTunes 4K
https://digitalworldhd.
UltraViolet HD
https://digitalworldhd.