Sport Loop in Black

This might depend where you live in the world. The UK site is showing available from stock, which is how I found it...

If there is no stock available locally for you, remember Apple's main launch event is usually September every year, and they will refresh for this. If your existing band will hang on until then you should have more options.

Nobody knows the future colour range until each product is announced. However, it looks like Black is now called Midnight - or at least that might be close enough to be acceptable