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I have a set of ProOptic tubes, that's the Adorama house brand. I've been using them for years and don't have any complaints, they fit tight, are built well and have all the contacts so the lens can communicate with the body.
Mine are all aluminum but they changed the design a while back and now have a plastic outer body. A friend of mine has the newer style and they still seem durable and reliable.
If your friend doesn't need communication between the lens and body you can also look for an old Vivitar set from the manual focus days. I've see them go for $20-30 in Nikon mount, Canon should be about the same I'd guess.