** Don't low rate this because you think this is expensive for a lightbulb. One bulb can often be up to £20. Read the details here http://hotukdeals.com/item/312937/100w-biobulb-energy-saving-for-suff/
Currently Ethicalsuperstore.com are offering Free Delivery. Using the attached codes 2 bulbs can be had for £15 for New customer or one bulb for £8.45 for existing customers delivered.