In case it helps, Nokia Ireland sells a pack of 3 for €12.09 incl delivery. On eBay the price is £15 each!

The snag is that both the delivery and card billing addresses have to be in Ireland despite the fact that the items are shipped from Belgium. Like so many things nokia it makes no sense.

Quite why Nokia's procedures have to be so convoluted is anyone's guess but the direct link is
http://direct.nokia.com/Product.aspx?model=StylusN800
Trying to find this page by any other route is very difficult.