Nashbar.com sells a very inexpensive front rack, normally for $16 but now on sale for $9. Not sure if they would ship to Germany, but a similar low-cost rack might be available from European shops. Some of the British on-line shops have wide selections of racks.
http://www.nashbar.com/bikes/Product...93_-1___202601
By the way, I have the Nitto rack (or similar model) shown in your first link. It is nice rack, but doesn't hold much as it's only about 10 cm wide x 21 cm long. Salsa Cycles includes a slightly larger rack with their Casseroll sport touring bike; perhaps they would sell the rack separately.
Soma Cycles also sells a relatively inexpensive front rack for about $30.
http://store.somafab.com/somialfrra.html