Could he build his own? They’re not that difficult to put together
Not for 50 quid. About £90 would be bare minimum, that’s if you already owned the radio gear.
I’m a fan of the Hubsan X4, but the Inductrix that Zilog bought which was recommended on another thread looks pretty cool.
One with a camera or at least able to fly with the weight of a go-pro or similar might have more use once the initial novelty has worn off?
This would need to be a 250 frame size or larger, which would be a bit big to fly indoors, (frame size is measured diagonally across motor shafts). The all in one micro quads are about 100mm or less. You may struggle getting one with a decent (2.0MP camera) for 50 quid.