You should be able to find 1 meter lengths (3 feet).
Try on-line retailers. I found many companies that sell 1 meter lengths. I personally use Tributaries Silver Series for my s-video runs.
No, you won't see any signal loss with just a 6 foot cable. You can start to see a loss around 10 feet or more. I use a Tributaries SA 201 S-Video Compensator for my 8 meter run. Not that it's really needed but what the heck, can't hurt. I don't use s-video for many inputs in retrospect.