Apple discontinued Magic accessories in space gray color. which includes Magic Keyboard, Magic Mouse 2, and Trackpad 2.
After discontinuing Apple iMac, the company has also stopped selling iMac accessories. Apple completely removed these accessories from the official website.
Apple recently unveiled M1 iMac with a completely new design and powerful hardware. However, the new iMac is available with new accessories, such as Magic Keyboard along with Touch ID.
Keep in mind these accessories are not yet available separately. The company might list it separately soon.