The 8-Bit Guy has released a Commodore CD32 Compatible Controller for the Commodore Amiga. Done in cooperation with TexElec, the controller has been ‘months in the making’ as Petscii Robots on the Amiga is ‘best experienced with a CD32 Controller, but they are nearly impossible to find.’
In addition to working with CD32 games, website states that the controller is also stated to be backwards compatible as an Atari / Commodore joystick, thus expanding the possible uses.
The controller is available for $25.00 here. You can also buy it bundled with Attack of the Petscii Robots here.