If you don't want to be foiled into buying a fake, I recommend taking a bite out of your wallet and going for expert dealership; buying helmets and other antiquities are a whole other world of telling fakes from coins.
Coins are much cheaper, since Prussia was one of the largest German states, it's lower-denomination issues are generally very common. Even it's thalers and commemorative Mark coins are common compared to those of the other German States.
By Prussian, I guess you mean only prussian pre-Germany stuff ?
Helmets, guns and other military stuffs are not that rare but quite expensive, and there are tons of fakes. It requires time to be able to distinguish the fake from the real.
Nonetheless, you can get some nice prussian beer mug (from the prussian time ) for reasonable price, or papers, books, posters,....
In Belgium ( i guess in France too and a fortiori in Germany) sometimes on flea markets you can get some stuff for really cheap prices with a bit of luck, even military stuffs, but it begins to be scarce these days.
Except ebays and flea markets or pro dealers (but then be ready to pay the price), I don't really know. I don't know if in Finland there are other sites than ebay to buy old stuff ?
You should decide if you want to hoard junk or start a serious collection. Imho its better to have 1 good item than hold stupid 400 items takeing up your space.
The best is to monitor the markets, i posted a good source already in your other thread, learn the prices, save up and wait for your special item to appear.
Citeer: "Monninen1"I am addicted I listened the whole 5 hour version of the prussian glory-march today
Prussia's traditionally got a mojo for military strength and punching above it's weight in wars, but woe to those who think Prussian militarism makes it invincible...
(Left; Prussian Garde du Corps sharpening their swords on the steps of the French Embassy in Berlin on the Eve of the War of the Fourth Coalition, 1806)
(Right; Napoleon leading French troops through the Brandenburger Tor in Berlin during said war, a few months later)
I have access to purchase a letter signed by Wilhelm II in 1893, have to buy it though. Creased left to right on the shorter side, like the first step of folding paper plane.
Citeer: "SquareRootLolly"I have access to purchase a letter signed by Wilhelm II in 1893, have to buy it though. Creased left to right on the shorter side, like the first step of folding paper plane.
Given Wilhelm's temperament and shortcomings I wouldn't be surprised if it was the first step in folding a paper plane...
I listened the whole 5 hour version of the prussian glory-march today 
