Flea bay, or you could do as I did and call a few local pc shops and ask if they have any battered cases that they are going to throw away. I got one for a tenner.
On flea bay, I got super lucky, I thought I'd check the price and availability of a full tower case (60cm high) and found one for a tenner, collection only, but was just round the corner to where I used to live.
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