How can i get my car back to driving, if the Receiver-Keyless Entry Immobilizer Module is discontinued? Is it any other option that I have?

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2006 Dodge Magnum Immobilizer Receiver Module Part Number 56038665AX was discontinued. This part can’t be found anywhere, and all dealerships are saying they are back-ordered until at least August. My car is at the dealership and i need this part in order to have my car driving again. What other option do i have, or what can i do now? Am I stuck with out a car, but still have to pay $1200 for a vehicle that they still could not fix? What can i do? Someone please help!!!