As others have said, replace the whole set, it'll be more economic in the long-term, and even if they are old an used, you'll have spare G, D, and A which are more likely to break than the E anyway.
i may have missed something above but I'd also check why the E-broke, for example was it twisted, is your bridge correctly setup, was something coming into contact with it? Breaking an E-string once is a PITA, breaking one twice because you didn't resolve the problem the first time around is a significant step up in casualness