I recently signed up to the Cinema Paradiso service and I'm currently impressed. My subscription is unlimited discs per month having 2 discs at home at a time. This costs just less than £13.00 per month. The current turn around for discs has been pretty good. I generally only watch films on the weekend so I imagine I'll get through on average about 8 films a month. Most titles are available in 4k so I'd say it's pretty decent value.
Here's a link for 30 days on the service for free.