I have actually started buying movie codes off those dodgy looking sites Disney hates. You can usually own a movie for the cost of a rental from Amazon, Google or iTunes.

I have never had a failure but I once had an issue with a purchase porting to Movies Anywhere from Google Play. Google was beyond useless in helping me out, I actually spoke with someone on the phone and it was as if they had never even seen the Play Store before. I emailed the seller about it and got an immediate email response with a couple suggestions to try before refund, the first suggestion worked.