I happened to be in an Office Depot in northern California this morning, so I checked out the power requirements for the printers on sale.
All the laserprinters (including AIOs) - 12x HP, 10x Brother, and 3x Lexmark were 120V only.
As I'd mentioned upthread the HP inkjets (including AIOs) have a dual voltage wall wart. The Lexmark inkjets had a dual voltage transformer plugged into the back of the machine.
The 6x Epson, 2x Canon, 4x Brother inkjets (including AIOs) were 120V only.
John