You may wish to turn collector, as Ihave heard that Cox is not in business any more. Look in the the Control Line forums to see if there are any there. Ihave one, but it is hanging on one of my walls. Ilearned engine tuning on one, after cracking up a Spitfire and P-40 as a kid. Then, I aquired many broken ones as other kids saw me fly on the local baseball diamond, and figured they could do what I had learned to do. When they couldn't, Igot the parts. I ended up with another P-40 and Spitfire, whole, after some contributions. I should have gotten a commission from the local store that sold them....While I was in the military, my parents moved, and Ilost all my Cox stuff. I found the PT-19 in a hobby shop while Iwas traveling about 4 years ago. Good Luck!
(Maybe you could build an r/c kit?)