Search on Google. You will find plenty of covers and acses. Brands you may want to see are Speck, Otterbox, Amazon itself, Wrappz and CaseMate
A few days ago I see that cover on amazon ( link on the bottom of the page), but is for a 13.3" Samsung Series 5 and I have a 15.6" Samsung Series 7.
If you know where I can find this cover but for a 15.6" Series 7 tell me and give me the link.