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Have you check joker.com ? I have recommended it to you, as you may see above. .de domain price is USD 6.00 / EUR 4.96, plus you'll get a free e-mail, so if that is too expensive to you, then you better look for a web-hosting package at some German-based web-hosting provider or similar that offers such domains within a package. In that way you can get a free .de domain for a whole year.
Oh, sorry, edong. I forgot that you want to be a reseller (and a 15 minutes since I posted has already expired so I was unable to correct my mistake). In that case, at joker.com .de domain reseller-price just starting from $6 USD.