Very nice upgrade-deal at GameStop for Germany, Austria and Swiss:
https://www.gamestop.de/ps4-pro
No matter what PS4 model you have and how old it is (of course it has to be in working condition with all cables and the controller), for €100 + 2 old PS4 games (bargain bin titles are okay) you get a PS4 Pro wit fresh warranty.
This is especially attractive for 3 to 3.5 year old PS4 models with 500 GB HDD and the warranty long gone.