The last one I bought was Fizban's, and that was not at launch but one day on a whim because dragons. Radiant Citadel doesn't appeal to me given how underwhelmed I was by Candlekeep, and Spelljammer is probably not something I am going to run since I am worn out on 5E. There is a possibility that I will buy the DL book out of pure nostalgia, but I will try not to give in to the impulse.