[Stayfree]

If I remember correctly, there is one at the air museum at March Air Reserve Base near Perris, CA and east of Riverside, CA. The museum is on the east side of Hwy 215.

[WMarshal]

There is an SR 71 blackbird on display at the Pima Air and Space Museum in Tucson Arizona, next to the boneyard:

http://aztecpressonline.com/wp-content/uploads/2010/04/Pg-14-Boneyard.jpg

[IronJack]

There is also one on display at the Air and Space Museum just outside Omaha.