I'm from Russia and they deliver here without any problem. Interestingly, there is no Russia on the list of countries on the menu which you use when you create a support ticket about an order. On the other lists of countries, however, there is Russia.
Maybe some of their lists of countries are incomplete by mistake? After all, they send international packages with USPS (at least they did with my orders) and USPS definitely delivers to Poland, doesn't it? It would be weird to deliberately exclude Poland for some reason.
As for the shipping costs, I believe that they are the same for all international orders: $25 for the first item and +$1.5 for every additional item.