I bought a basic Epson SX130 printer from PC Word for my mother about 6 months ago that cost £25 (reduced from £30).
It does print, copy and scan and while quite slow has been fine.
This is it at Argos
http://www.argos.co.u...artNumber/9371424.htm
Note that the biggest pain with inkjets is that the replacement inks can cost more than the printer (if you buy genuine inks). You can buy cheap clones, though I have had clogged heads using cheap inks.
A laser printer may be better if he does mostly documents as opposed to photos. They do cost more up front, but the toner lasts much longer.