You can program any IR remote (like, for instance, your TV remote) to act as your AppleTV remote. Much more convenient than using the provided-by-Apple remote.
Of course to teach the Apple TV you'll need a working remote or mobile app, so if you don't have any iOS devices you may be out of luck.
I recently lost my apple tv remote and buying a fire stick is more attractive than trying to figure out where to buy a new remote and how to set it up.