[Bertiebobbins]

I was the kind of student that definitely wasn't responsible enough to have a pet ha ha!

Aside from the running costs, which aren't much after you've set the cage up (which can be pricey), you need to consider if you will be able to pay an unexpected vet bill should your hamster need it. This means either you know you have enough money as an ongoing thing, or you can put a sum aside as a contingency.