The generous chaps at 7dayshop are offering not one but two silicone cases for 49p. Incredibly, that price also includes delivery. Brilliant.
The only downside is that one of the cases comes in girly pink (the other is clear), but that might suit you nicely, depending on your (a) sex, and (b) sexuality. It’s all good.
The cases are specifically designed for the iPhone 3G and 3GS, however 7dayshop reckons they fit quite nicely on the iPhone 2G too.
7dayshop will give you your moolah back within 30 days if you’re not “101% satisfied”.
(Thanks to lucerysmum at HUKD)