spare S4/TA6/TA10 power supplies can be purchased from NI
maybe you know it, maybe you don’t, but NI have a new accessory - a PSU for A6/A10/S4:
http://www.native-instruments.com/index.php?id=4101&prid=386&redirected=1
retailers should also have them, I guess. just saw it and a searching shows that no one shared it yet, so I thought why not share it …
HTH, cheers!