"Back in the day" Redbox didn't exist. :-D I've gone to Redbox and have the same problem.
I feel that queuing up a guaranteed watching experience from Amazon is worth the hassle of an extra few bucks compared to getting in my car and driving somewhere. (Yes, I assume I could walk or ride my bike. I've never actually been to a nearby RedBox so I don't know how far it is.)
There is the option of hopping online to check the specific RedBox you'd be going to, to see if there's a copy and if available, reserving it for yourself.
Still possible for it to not have a movie you want, but at least you'd know that before leaving the house.
I feel that queuing up a guaranteed watching experience from Amazon is worth the hassle of an extra few bucks compared to getting in my car and driving somewhere. (Yes, I assume I could walk or ride my bike. I've never actually been to a nearby RedBox so I don't know how far it is.)