right now there are no accesories that keep dust out.
but there are many ways to keep the dust out.
some people say put it in a zip loc bag. other people say go to the bathroom and turn on the hot water in the shower. the steam will keep all the dust in the air from falling. then you take apart ur psp. and you use a cloth to wipe all the dust from under the screen. and put ur psp back together.
i have alot of dust under my screen. but i dont want to take apart my psp.
also some people just keep on returning there dusty psp to get a new one but my warrenty has expired
vinnypspyeah also told me some way to get dust out and it didnt include taking it apart or putting it in a zip loc bag
im gonna pm him right now