Less than 20 quid seems reasonable enough for this angle grinder at Lidl, instore from Thursday 20/03/14 complete with a 3 year warranty.
Product Information :-
Variable no-load speed from (rpm): 3,000 - 12,000
With 3-position front handle and aluminium die-cast gear housing
Spindle lock for effortless tool change
125mm cutting disc and spanner included
3 year manufacturer's warranty