Hey there, the Quest 2 Touch controllers are not compatible with the original Quest unit. You can click here to sign up for notifications on when they may be back in stock on the website, or to check and see if any retailers in your area may have them for sale. If you're still within your warranty period however, you can click here to contact us so we can look into our options to help you out!
At the moment the Quest controllers have the "Not available" disabled button instead of "Notify me", so there's no notifications available.
After talking with Oculus support they advised me that the Quest 1 controllers are no longer supported/ available. They have been made a discontinued product. Your best bet is to try and fins a used one of eBay or try and get lucky with your Oculus retailers in your region. Good luck, we've all been left out to dry.