The photo the DPRK released showed a fairly small drone with a triangular shape. It doesn’t look sufficiently large to fly all the way from the ROK to Pyongyang, drop some leaflets and return to the south, meaning they should have been able to recover the crashed drone. Also, if it were a civilian group, they usually take credit for the balloons they send and none have said anything about sending a drone to the north. It really seems like something might be going on internally and the DPRK is trying to blame whatever is happening on outside agitation.
Price tracking systems like Keepa and CamelCamelCamel wouldn’t work if they started doing this. I can verify that, when I get alerts, the price on Amazon is the same as the alert price.