hi i recently found i think the same buttons as nord lead use for their synths.... i call the company in France and the price is around 2 eur with taxes if i buy 200 of them and different color marquardt france sent me one and it's exactly the same than the nord lead .. maybe i'll have to buy for around 400 eur so if someone is interesting to join me , you're welcome this is the link : http://www.switches.com/Products/Keymodules.aspx 6450 the yellow one if someone can get cheaper in germany maybe it would be nice bye :D