Hard drive prices. I bought a 1TB drive about a year ago for £40. Now the exact same model seems to be available for no less than £70-80. And if I want a larger drive (which I do), then it'll cost around £95-100 minimum, with most of these being pretty poor quality.
I just discovered my anime collection has grown by more than 700GB in the last 10 months, and I really need a new drive, but there's no way I can easily afford a decent one at these prices =/