Paola, maybe something like that will fit your needs:
http://www.amazon.de/Belkin-Neopren-...7285856&sr=1-1
or
http://www.amazon.de/Belkin-Pleated-...7285856&sr=1-7
or
http://www.amazon.de/Cool-Bananas-En...86693&sr=1-112
It's the german amazon site and the second case most certainly has the wrong dimensions (see reviews post) but I just wanted to show you some examples in which direction to look. Do you have an electronic market near your home? Maybe you can go there and try the size of some cases.