http://www.amibay.comWhilst I'd like it, I could not pay the going rate. If you're very good with your marketing I would imagine (depending on the speed of the unit) you'd get about €400-600 for it. Perhaps a little more if you agreed to ship anywhere in the world.
If you are in the UK there is of course direct bank transfer. If you're in the Euro Zone you've got IBAN transfers. On top you've got MoneyBookers, Western Union, MoneyGram and possibly countless others.
Non of these offer a "secure deal". Neither does direct payment via PayPal.