Those Armstrong sets are kind of pricey right now, no idea why. But if you set up notifications on ebay, discogs, and what have you, and watch for a while you can generally get them for the original price ($15-$17 per disk), or less. For ex in 2022 I picked up #146 The Complete Decca Studio Recordings of Louis Armstrong and the All Stars, for $78 (box, book, the works, shipped).
Two are available on spotify (and presumably as downloads from the usual sources):
Louis Armstrong The Complete Louis Armstrong Decca Sessions (1935-1946): https://open.spotify.com/album/4ePSSZbkcek6jALbNtztI8?
Louis Armstrong Columbia And RCA Victor Live Recordings Of Louis Armstrong And The All Stars:
Vol. 1: https://open.spotify.com/album/7GwSrFicvM59OYCAFsDB4q
Vol. 2: https://open.spotify.com/album/5oPUTne7UdDcLUsRKpODvW
Vol. 3: https://open.spotify.com/album/6caWTu3uR6ykaFv1asaqwG