These laser spirit levels look good value for £6.99, they will be in Lidl from Monday 05/08/13.
Product Information :-
Magnetic for secure holding
2 bubbles with LED light for horizontal and vertical alignment
Accuracy (mm/m): 0.5
Max. height with tripod approx. (cm): 32.5
Height-adjustable mini tripod with ball joint and batteries included
3 year manufacturer's warranty