A replacement supply probably won't be a cheaper solution - last time our company "lost" a supply (there are 100v and 220v sockets in most places, and some idiot always plugs something into the wrong one!) the price of a replacement Canon supply was exorbitant!
I'd go with a "cheap" 110/220v transformer; I'm sure he can get one from any electrical hobby shop or electrical/electronic parts supplier. One warning though; do get one with about twice the wattage rating that the printer is supposed to need as the cheap ones tend to be rather inneficient.
Also make sure that it's located somewhere that it can get a decent air-flow as they get hot even when the printer is off!
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What Goes Around . . . . .
. . often makes a better landing