RWS brass can be obtained by any gun dealer over here (in Germany). Costs per shell around 1,00 (!) Euro ...

Better source for one-time fired ones:
www.egun.de, better: http://www.egun.de/market/list_items.php?cat=241
and
www.hunting-sport.com.
The latter offers them at 300 each for 62 Euros.

If wanted, I can step in as mediator.

I use RWS brass, usually at 20 to 30 Euro/Cents per cartridge.

Joachim

btw:
"Hülse" means shell/brass
"Preisliste" means "price list"