Can anybody tell me if there is an online store that sells the patriotic baseball hats / caps that the players were wearing on July 4th and September 11th. The hats were dark blue and had the team emblem, but the emblem was in red, white and blue.

Just a fitted cap in all black or dark blue with just the MLB logo on the front. I know they are out there.
I know I can find Team Logo caps at all of these places. I am not looking for a particular team but the MLB logo by itself on the front of the cap. The MLB official store is out of them but there has to be some for sale out there.