We budget around £150 per child, DS2 has ended up with two 'big' presents (headphones and binoculars) that have already taken us to £140 but with Black Friday deals we couldn't pass it up. Headphones are something he's asked for, binoculars he'll mostly use at night for stargazing so I'd like him to have them in winter rather than hang onto them until his birthday. He's a good kid and understands we've got budgets but I would like him to have a couple of bits more to open! As well as space he's into anything science/engineering, big Tube geek, Spurs fan but doesn't really play sport himself.
The £150 isn't a strict limit, I'd be happy to spend around another £30 or so.