Amazon.com lists an import copy of the Bongos' CD *Drums Along the Hudson*. Its track listing includes "Mambo Sun." One left in stock; it "usually ships within 24 hours." Cost: $21.49 U.S.
Then again, that's about the most obvious source imaginable, so perhaps you've tried it already and found Amazon's online information to be inaccurate.
Other selections that include the Bongos are listed. They all appear to be out of print, and available for a king's ransom. Good hunting.
