As I replied on the other thread, ebay is most likely your best bet.
The original DVDRW is a great little drive that is powered from the notebook, a def. must buy.
I would try and find the OEM WiFi card as it seems to fit the notebook pretty well.
The mouse isn’t necissary and I’m not sure I would buy it unless I found it very cheap. I personally don’t use an external mouse, but if I did I’m sure I could find a better one then that.
The case that came with the system is good but doesn’t have a strap, not sure if that is an issue for you but before buying it, it’s something to consider.
Good luck,
Erik