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 bought for the family at Christmas, good shape, we simply prefer our 1941 edition
$49 plus 6 shipping, all parts are there, played 3 times, great condition
Pay via Paypal, send me an email. bbiermann@premier-ks.com
Since I am new to this forum I can give any interested buyer a link to my facebook, twitter, other forum accounts, etc since I don’t have a reputation here, let me know!