54Y8884 - 280W For Lenovo ThinkCentre ThinkServer AC Power Supply - 365PowerSupply.com - Replacement Laptop Power Adapters,Desktop Power Supply & Server Workstation PSU.
Refurbished: Lenovo 54Y8825 Lenovo 240 Watt Power Supply For Thinkcentre M70 M91P M81 Sff - Newegg.com
Lenovo 240W Power Supply for ThinkCentre M81 | Laptech The IT Store.