thanks mate, I already saw them a few weeks ago and at that time they were priced at 100eur, which was way too expensive for me ...You didn't say what colour you needed but there are a few on kleinanzeigen if you are able to use that site:
eBay Kleinanzeigen ist jetzt Kleinanzeigen | Kleinanzeigen
Kleinanzeigen: Roox Twister, Kleinanzeigen - Jetzt finden oder inserieren! eBay Kleinanzeigen ist jetzt Kleinanzeigen.www.ebay-kleinanzeigen.de