Just poped in to my local tesco and they had a offer on all Tesco or GE SPIRAL Energy Saving Lightbulbs. 3 for 88p.
Its regardless of type, Edison Screw (ES), Small Edison Screw (SES) and Baynot Cap (BC)
On my reciept i saved £5.00
Cant see this online, must be only in the stores nationwide.
Hope this helps