Dear Manos,
it is very kind to pass on informations of your friends intended trip to south Germany. But i'm afraid, he will not find proper second hand RIBs in te german area, while this market ist still very poor. The real market ist Italy.
Please find here some links to advertisement there:
Um Links zu sehen, bitte registrieren
Um Links zu sehen, bitte registrieren
Um Links zu sehen, bitte registrieren
Um Links zu sehen, bitte registrieren
Um Links zu sehen, bitte registrieren
The last one is one of the best, you can select the made. Suggest to Your friend to look to the MARLiN Versions, where he will find very fine modells with innborders in the major models.
Cheers