If you're playing "Normal" game speed no wonder you can't get the stuff. I play on Very fast as most of people here. And in 20 pt you can progress to 18c build 2 18c barracks make 3 17c barracks and order ~300+ dragoons 18c. And in 5000 resources lol. Ofc minerals should be rich on the map. But still once you said that Prussia musketeers are that expensive it tells about inexperience no offence m8 .