Looking for a place to buy some items:

I am looking to make a shadow box for my grandfather. I have replacement medals for him and would like to make a shadow box using some other items from his uniform, however, I don't want to take things off the uniform.

I need:
Marksman badge for Driver-W (http://upload.wikimedia.org/wikipedia/en/d/d3/DandMBadge_(Small).jpg)
Honorable Discharge Badge
Private 1st Class Rank Insignia
Collar Insignia (1 US, 1 Artillery)
102nd Field Artillery Battallion (2 on uniform, but I only need one for display)

He also had a marksman badge amongst his misc. items and I am not sure if its for his carbine or his at all. Anyway to find out using his discharge or basic training papers?

I am wondering where I can purchase WWII era items for my shadow box. Any good websites or should I just watch ebay?