You can try eBay. Some people buy whole games and sell the pieces off separately. That can be a good source for little bits, when you don’t want or need the whole game again.
I have all the goodies and extras from original game… i opened one of the two boxes just to check out the map. I will sell for cost, plus actual shipping. PM if interested
I wanted to give out some kudos and say thanks to Field Marshal Games! I ordered some Combat Dice and Italian units and am very pleased with them! They are simply amazing products!