I used to recommend Samsung Ezon deadbolt locks, but now they are changing firmware in the locks but not changing the model numbers, so there is nothing but confusion now with regard to compatibility. This is why we have started efforts to build our own; https://forum.dangerousthings.com/t/open-source-deadbolt-lock
However, I assumed you are in the US and need a deadbolt. Where are you located and what type of lock do you need?