At the right time, Aldi. Bought a couple of "welders accessory kits", 7.99 each (I think, certainly under a tenner), comes with two magnets, three files, a springy hammer thing (not the technical name, I guess) and a wire brush. The magnets appear at various car shows, usually about a fiver each, so compared to that it's a good deal. My local one has boxes of three welding clamps for 6.99 at the moment, and they're not terrible.