I believe the company that Kratos bought out that was working on a red air training UAV advertised its model as being potentially able to go supersonic using maneuvers (I presume a climb to ceiling and a dive) but in general I think <$10 million UAVs are going to live below the sound barrier. Somewhere on this board, perhaps a couple years ago on this thread, I had proposed using RATO boosters to get to supercruise as a one shot "turboboost, Kitt!"* for a UAV that was otherwise able to sustain a supercruise. But on the other hand I can't imagine there's a small turbofan out there with a low enough bypass to sustain supersonic even after a drop kick through the sound barrier. If you have to build a specialty engine for the UAV, I think you've lost a lot economies of scale. I'm sure there are other problems with the ideal as well. But I think a reheat engine for the CCA is probably a nonstarter for weight and cost.
*Yes, I watched Knightrider as a kid. Don't hassle the Hoff.