Lidl will have these packs of 2 magnetic LD lights instore from Thursday 23/01/14 for £4.99 which seems pretty good, you get a 3 year warranty on them as well.
Product Information :-
Sturdy and vibration-resistant, each with 24 bright, long-life LEDs
Strong magnetic holder and 360° rotatable folding hook allow for versatile usage
3 year manufacturer's warranty