Just got a blue (there were black and pink versions) Logitech wireless mouse in Tesco. Reduced from £30.00 (I think - memory not what it used to be).
Still £29.97 at Tesco Online.
Had quite a few. This one has the discreet USB dongle so can be left attached all the time.
I think this may have been posted a few months back at a different retailer.
Seemed a good deal for a good brand wireless mouse.