Does Directfix sell legit chargers?

Not sure what you mean by "legit", they will be the same quality as the other cheaper non-Apple cords. I've used many cheap iBlah connector cables from China ebay sellers and none had any issues. If you are asking if they are "legit" as in the real OEM Apple brand, probably not but there is a small chance they may have the same maker.

The fix for going though chargers is usually to just be more careful with them.