I needed TRK #4 cams a while back and let me tell you I felt like I was trying to locate, capture, and tame Bigfoot! It was a challenge is an understatement.
I called every archery shop I could find info for on Primes website as authorized Prime dealer, and I think on the 28th shop I called they had a set. I paid $90 for just the top cam(was the only one I needed), and you can get the set brand new from Prime for $170 so in your case it may be cheaper/for more time effective to go that route! Good luck!