If you’re in the Apple ecosystem, getting movies and shows on iTunes is the best place. Great player, tons of deals, synced across all devices seamlessly. If not, VUDU is pretty much the next best. I have an xbox and amazon prime and even with deep sales, I almost never get a move or tv show there unless it’s on iTunes. I’d rather wait for the sale to show up there instead. It’s just that much better and simple IMO.
I’ve been doing two things, using cheapcharts and Ms Rewards. I’ll only buy a movie on my xbox if I know for sure it has movies anywhere enabled. Learned my lesson when I first started collecting and bought all John Wick movies there. Ugh. I heard good things about the Blu-ray site too, so it doesn’t hurt to double check. Using the wishlist feature on iTunes is useful too, as cheapcharts doesn’t show a sale immediately. Another reason I prefer Apple is cause I’m partially deaf. I’ve never encountered a movie or show on appletv app that shows subs incorrectly or with delayed input. Parent Trap, the Jetsons, and a few other shows have horrible captions. I actually bought the Jetsons a second time on iTunes just to “fix” this.