I was in Homebase looking for a bedside cabinet yesterday when i spotted that they had a whole stand full of Philips energy saving light bulbs for 10p a bulb!!
I bought 20 for the house incase any go pop in the future.
They literally had thousands on display.
Apologies but i didnt get a photo so i cannot prove it, but this was in Homebase Leytonstone.
Definitely worth checking your local store