The official part is 902-1169-EU00 (but you can use any regional 902-1169 model, and just use a local power cord).
But the ZD1200 accepts any standard 5.5x2.5mm 12V supply, so you can use whatever 2A+ 12V supply you have lying around your house, so long as it fits.
My trick is to pickup obsolete $1 ISP routers on local auction/marketplace websites. Look for routers with 2.5A supplies: 2A supplies usually have the smaller 5.5x2.1 barrel.
