Less than 10% of the search results on Amazon Prime Video for Stephen King were actually Stephen King movie adaptations. There were a ton more that were derivations of Stephen King novels, for example ...

• The Last Stand (The Stand)
• Stand (The Stand)
• One Night Stand (The Stand)
• Wendigo (mentioned in Pet Sematary, Desperation and Bag of Bones)
• Stand By Me (I found another non-SK movie)
• In The Dark Half (The Dark Half)
• Red Rose (Rose Madder)
• The Skeleton Key (Skeleton Crew)
• Frozen (no idea!)
• The Last Gunslinger (The Gunslinger)
• The 41 Year Old Virgin That Knocked Up Sarah Marshall And Felt Superbad About It (WTF!?)
• King Corn (Stephen King?)
• The Cell (Cell)
• Interview with the Vampire ('Salem's Lot)
• Key Largo (Duma Key?)
• Outside Ozona (The Outsider?)
• Sometimes They Come Back ... For More (Sometimes They Come Back)
• Sometimes They Come Back ... Again (Sometimes They Come Back)
• Pet (Pet Sematary)

I stopped on page 21 of 48. There were a ton more than didn't even make sense for Stephen King.