Lego Mini Key-ring Torch £6 > £3
Lego Torch £15 > £7.50
Lego Head Lamp £8 > £4
Lego Brick Light £10 > £5
Prices are approx as I didn't think to make a note of them while I was there! Sorry. Head Lamp is defiantely right, cos I bought one of those.
They're on a free-standing display in my local store.