I'm always leaving these things behind in hotel rooms but found this deal when searching for a new one. It does seem to be half the price elsewhere and is a good deal if you don't want a key operated lock, or want to lock down something without a Kensington lock such as a suitcase.
From the Tesco Direct site:
The Targus Defcon laptop cable lock is suitable for laptops and other personal belongings. This Targus portable security cable lock is ideal for use in the hotel, a car or an airport and comes complete with 4 digit combination lock with 10,000 possible combinations.