I’d put a wanted ad on e-bay. Do you know any polish people or where their nearest community is. Most countries seem to move to the same area when they come to another country so u could try finding out where that may be, but I wouldn’t know where. I know Croations hang out in Livepool N.S.W. Vietnamese are in cabramatta N.S.W. AND Muslims are in the Bankstown, Punchbowl areas’ so there would be an area where Polish people gather. Good luck maybe u could ask that question on this site ? There r other auction sites too!

Try ebay. That might work.

Any websites that sell tactical gear or airsoft gear. Let me warn you that the vast majority of U.S. dealers sell U.S., German, British and Russian military uniform.

Try Sprotsman Guide .com

Or just search Polish militaria on google

This is a Polish website with lots of military stuff:
If you do not speak Polish check “ubrania” (clothes) here: