There is the Kryptonite modulus system: http://www.bikeradar.com/news/article/n ... te--25187/ I think that Planet X were selling it for under a tenner at one stage. Mind you, that is probably because it is cables based and a decent pair of bolt cutters would get through them in seconds.
the above is the more secure of the Bordo locks, is rated by Abus at security level "15", same as the U-lock Granit Plus, I am not sure though if it is so strong?
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the above is the more secure of the Bordo locks, is rated by Abus at security level "15", same as the U-lock Granit Plus, I am not sure though if it is so strong?