If it’s not currently on your subscription services, you can find it for digital rent or purchase on: : Available to rent or buy. Apple TV / iTunes : Digital purchase and rental options. Fandango at Home (Vudu) : Available for digital streaming.
By searching the film title on these sites, they will pinpoint exactly which platform is hosting it for free with ads, via subscription, or for rental in your specific country.
Rental typically provides a 30-day window to start watching and a 48-hour window to finish once started.