Aria is selling a 1GB USB2 flash memory pen drive for only £58.69 including VAT. That's the cheapest 1GB pen drive I've seen by a few pounds. Shipping will set you back another £7 though which is expensive for such a light product (Aria are you listening?).
This is in their specials section and they don't have many. If it goes out of stock keep an eye on the page for the next few days as they tend to restock.
Where:Aria Specials Page
How: Follow the above link to the Aria Specials page and scroll down until you see the 1GB pen drive in the left hand column.