Welcome the the Club of Plugs with fried power supply.
I found USB Hubs to be a cheap source for 5V power supplies. Got a 13Port USB hub with a 4A/5V Power supply (4A is propably overkill, but better save than sorry). It now powers the Plug, the Hub and the devices connected to it (including a 2.5" Hard disk).
Previously i used an 1A power supply for the Plug alone, but it overheated after a day of use and shut itself down together with the plug.
Also tried a power supply from an unused harddisk case, which has a 2A/5V rail, but the plug refused to power up with it. Not sure why this did not work.