As others have said, Effest, Xtar and Nitecore are very good chargers for the price. I own several chargers from these companies and not had any issues with them.
Just check that the model you look at accepts 21700 batteries if that's your thing.
I use a Nitcore D4, Luc 6bay and a couple of Xtar 2 and 4 bay chargers, all been working for years now.