Last was Call of the Netherdeep, a month or two ago, on a rare trip to my FLGS. Previous purchase - Strixhaven - had been a few months prior, mostly a pity purchase from an ailing game store.
Up through 2020 I usually bought the new 5E hardcovers as they came out, but that habit died last year. Now I wait to see the general response and make my decision based on that. (For example, I have no intention of buying MOTM.) Radiant Citadel is the first one in a while to actively interest me, but I'm still going to wait.