MiniInTheBox offers this Fidget Spinner Case for iPhone 7 / 7 Plus and iPhone 6 / 6s / 6 Plus / 6s Plus in several colors (Black/Red pictured) for $2.49 with free shipping. (Choose "Postal Service - No Tracking" during checkout. A 50-cent small order processing fee automatically applies.) That's the lowest price we could find by $3. The spinner is removable. Click here to see it in action.
Note: This item ships from China and may take two to five weeks to arrive. Uncheck "Add shipping insurance to your order" during checkout to remove the 99-cent fee.