I have a quantity of Aquaspec lifejacket lights, same as here:
Good quality lights; I have just fitted them to all of my jackets.
They are brand new, and have an expiry of 03/13 - so you've got 5 years before they go out of date.
As you can see from the above link, they normally go for about £20 each. I am asking a tenner each including postage. Will do a discount for more than one. PM for details. Paypal is best for payment, or swapsies for anything interesting!