The best gear covers in the DJ and production business are definitely made by Decksavers. We've been reviewing them on this site for a long time and we can't give them enough praise. Decksavers has just created new covers for the entire Denon Prime setup including the SC5000, X1800, and the VL12 turntable. They've also created a cover for the Mixars DUO Serato DJ Mixer.
The Decksaver covers are affordable and protect your gear while in use and while in transit when inside of another case or bag. They always have a great fit and I still have yet to break one of them after years of use. Check out the full lineup of Decksaver covers at http://www.decksaver.com/