NoInOi,
Personally I haven't looked, but for starters, what you could try is placing a Classified ad in our "Classifieds" section
here. Maybe someone might have a spare part of a part from a dead player they are willing to sell.
Or you can try eBay as well. I haven't looked.
I will try to get a hold of some manufacturers I know and see.
The difficult bit is that there are a lot of variations in the players, their casing and design. If I can get a hold of parts, since they are a manufacturer, they will probably want a large quantity.
Post some more information about your player though and let's see if anyone else can help too?