Hi Henni
I bought a reconditioned one. It works flawlessly.
https://www.ebay.com/itm/Microsoft-Surface-Pro-3-12-i3-i5-i7-64GB-128GB-256GB-512GB-4GB-8GB-RAM-Win10Pro/162625099952?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact