OK - Israel is a little tougher.
As far as FS section goes - I've had plenty of purchases and sales on these boards. Most of the gear I've had has been second hand. I haven't had an issue with a single purchase (apart from 1 pair of HD600s - but I knew the driver needed replacing, and the price allowed for it).
Most people here tend to baby their gear - and best thing to do is trade with someone who has a good history and excellent feedback
It's your call really - if you want to save some money, buying on these boards (with due diligence beforehand) is what I'd recommend. Otherwise try emailing Sennheiser direct, explain the problem and see if they have a recommendation.