Where can I find Malagunea by Stan Kenton for Tenor Saxophone only?

I don't think you are going to be able to find an arragement of Malagunea by Stan Kenton for just tenor sax. Malaguena was an arrangement done by Kenton for his big band that appears on the Adventures In Jazz album. You might be able to find an arrangement of Malaguena for just tenor sax, but not one that was arranged by Kenton. If you want just the tenor sax part for the big band arrangement you would just have to find someone or some school that has that arrangement that you could copy. Stan Kenton before his death gave North Texas State University the entire Kenton library of music that he had written or arranged. If you are just looking for the tenor sax part of that arrangement you might contact the Jazz Department of the NTSU School of Music and see if they could help you.