Just a little warning, there are a LOT of fakes of these around - the one in the link sadly looks like it might be one of these - they were from China, and sold as 'sterling' but were actually plated metal, and even had a fake links of london logo on.
You can make them with a bunch of jump rings though. They're just on a piece of stretch magic.
Otherwise, Dreambell sells a modified (half hollow) link - they even tell you how many you need to get for a full bracelet. I seem to remember they worked out at about £20 to make.
george
