I dont know where you are located, but I know there were a few J30's @ LKQ off 118th in Clearwater/St Pete. That could be hit or miss though and for a daliy, might not be advisable. Seems ashame that there is such a huge $$ difference from a 240sx. They are kinda apples and oranges though.
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If it has tires or boobs it's going to cost you money...