Ah okay so about the same as in The Netherlands.
A trick here would be to go to a book store that sells Kobo but also accepts national book gift card or "VVV" gift cards. Often people get given these gift card things at birthdays and then never do anything with them... (I have several lying around the house.) Unfortunately there aren't many book stores here that sell Kobo. And you seem to say the same about Germany? Do you live near the Dutch border? I know Libris sells Kobo.
According to
http://www.kobo.com/koboglo/wheretobuy/ for Germany, the sellers are:
Staples
Euronics
Expert
Media Markt
Redcoon
Saturn
Electronic Partner
I saw that Redcoon is selling certain colour version of the Glo for €123... But that might not be a big enough 'discount'. Wehkamp.nl in The Netherlands sells all colours for €122 I think, but I'm not sure if they send to Germany.
Alternatively, you could look for second hand ones anyway. People that have just bought one but prefer to get a Kindle Paperwhite for example... You will still have most of the one year warranty as the Glo's are still new – so at least until October ? I think.