Walking around with the family today hunting for dresses, my wife pointed out what was in the window of Oxfam. A lot of Horus Heresy novels no less! At GBP 3.50 each, I bought these pair, as well as a several books for the rest of the family. A bargain! And helping charities at the same time!
The morale of this tale is to keep your eyes open. There's often lots of things around the place that are cheap, or could be turned to enhance the hobby. Buttons and cork being just two examples from yesteryear.