Thank you

I'm afraid not. Balance cords are not sold separately and we strongly advise against trying to replace them yourself due to possible risk of bodily harm. These springs are under a lot of tension and one bad move trying to replace the cord means you're going to have 30 pounds worth of steel spring shooting back at you. It's not worth trying, and for this reason you won't find any company willing to sell balance cords, including our own.
If the cord on your balance has snapped, you need to get an all new balance assembly. There is no alternative.