I picked up off TradeMe two APC 750XL model number SUA750XLI UPSs and in theory the second one was a "spare".
But I can't get it working and neither can @michaelmurfy so I have decided it's busted but if your geek fu is stronger than ours then you are welcome to it.
Doesn't include a battery but can sell for $80 a AP9619 NMC which includes a temperature sensor if you wanted one as I purchased two NMCs for each UPS but as the UPS doesn't work I have removed it.
Free to a good home in Wellington, pickup required as I am not delivering it anywhere.