The only other colors than green,red,yellow I've seen have been Blue and orange.
You most likely have either .019 or .029 fibers in your sight.

Try www.zenitharchery.com Joe at Zenith sells the fibers in lengths over 12" long.They aren't on his sight but I know he has them.Drop him an email he will help you out.

You could also try www.baxtersarchery.com I know they carry the blue fibers.