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Easy to get the new ones Max, but where and how did you get the old ones? 
Ebay my friend
Although I did buy a few at the Oldsmobile Museum's gift shop.
It is located right accross the river from the skyscraper my dad works in, in fact I should go back there some time and take some pictures of the cars.
They have a beautiful selection of Oldsmobiles from ranging from 1897 to 2004. You would simply love it CCF
The reason the Oldsmobuile Museum is located here in Lansing is becuase until Oldsmobile's demise in 2004, Lansing was the official headquartes for the brand, and many factories produced Oldsmobile cars here. For this reason, it is quite common to see tons of Oldsmobiles, old and new, roaming the streets of our city.
More info on the museum:
http://reoldsmuseum.org/