Does anyone know if there are any CAN shields out there that would be compatible with the Arduino DUE?
No need for a CAN shield since the DUE has 2 CAN buses (CAN0 and CAN1). However, you will need CAN transceivers (3.3V CAN transceivers).
Note that for your first tests, if your cables are shorter than 2 or 3 meters, you don't even need CAN transceivers, only a fast diode and a resistror (see Siemens Application Note AP2921. +5V must be replaced by +3.3V for a DUE)
Plus there is a CAN library for the DUE:
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