After nearly 40 years you can still buy the original soundtrack by Lalo Schifrin.
The soundtrack can be purchased from a number of retailers including Lalo Schifrin’s own website.
There are some soundclips at CD Universe.
Lalo Schifrin released the Dirty Harry Anthology in 1998. The album contains music from the original soundtracks of Dirty Harry, Magnum Force and Sudden Impact.
YouTube has Scorpio’s Theme.