If you missed out on this promotion by Morrisons & Lidl recently, Homebase now have the same offer
However these are only the Philips 11w BC energy saving light bulbs.
49p each or 5 for 50p!
(these are equivilent to 60W traditional bulbs)
I think the recent offer by Tesco offering 5 energy saving bulbs for 40p (not Philips) has now ended.
Note that this is a special promotion and may not apply to their usual stock on shelf. Look out for the special display stands in-store. Like the morrisons deal, these boxes have the eon sponsoring logo on them.