£14.99 seems a pretty good deal for a decent sized magnetic white board like this, these will be in Lidl from Monday 02/09/13.
Product Information :-
For attaching notes to or writing on with dry-wipe markers
Can be wallmounted vertically or horizontally, materials included
Includes 3 magnets, board eraser and pen with magnetic holder
Size approx. (cm): 89.5 x 59.5 x 1.7
2 year manufacturer's warranty