Contact MrMoPar and see if he has one, otherwise play the searching game on car-part.com.
They have a TON of right rears, but seems an "unchipped" one runs around $200.
You might try calling some of the ones that don't list a price.

I have had good luck with these breakers, got my autodim rear mirror ( $25 ) and 74mm throttle body ( $80 ) through that site.