Lidl, the bargain-basement supermarket chain, is running a bike promotion right now. Among the promised cheap items are bike light sets for £10, bike hoists for £5, and computers for £4.
Hunting round stores in previous promotions I've been disappointed. I've only ever seen bike shorts and drinking bottles actually on sale. Perhaps it's just as well, given my history with bike computers. No sooner have I established that my house is 216 calories from Kings Cross and the journey takes place at an average altitude of 19 feet than it gets stolen, broken, left on the Cambridge milk train, or reset by a rainshower to 26 inch wheels.
Still, maybe worth a look if you're passing a Lidl. You can always stock up on Arabic-language bottles of lemonade, Portuguese baked beans and Lithuanian chocolate while you're there.