What is a legit WWII Japanese meatball flag worth, nowadays?

Ok.. I know this isn’t exactly an milsurp question, but I figure the members here could still lend help.

I’ve been collecting Arisaka rifles and I think a meatball flag would be cool to have with them.

I know most people go for the good luck flags covered in signatures. I don’t know why, but I prefer the big white flag with the red ball in center (the national flag).

How much does a WWII era flag like this cost?