I was not able to find anywhere a neoprene case of the proper dimensions: Have you some suggestions?

In order to answer to the topic: I treat my n900 with extreme care, but I am not using the screen protector. I know that the screen will not stay perfect with time, but these wil be the signs that I used and enjoyed it. But I don't think that it will be damaged in a distruptive way before it will be the proper time to buy a new phone.