Storage boxes for Video games?

I have approx 250 computer and PS2 games, as well as a bunch of other console games, and obviously a lot of time and money has gone into that collection. I have some storage boxes that I keep most of them in already (type: really easy boxes), and I store my consoles in cardboard boxes, however I may be going to university next year, and I will not be able to keep my bedroom locked, and obviously I can't take them with me. When I am here there is no problem and when I go out I can easily just lock my door, however if I am at university (where I will be living on campus), I have been informed that I will not be able to keep my door locked then entire time (there are reasons for this).

I have been looking, however I can't really find any lockable storage boxes to keep them in. The few that there are seem to only hold like 8 games or so and cost £30. The only other things I've been able to find are storage boxes for gardens, but they are clearly too big to go in my room and don't actually lock. It's important that I lock them away because my brother is a thieving little ***.