Retail blaster boxes of 2021 Upper Deck Space Jam: A New Legacy trading cards are out. I've added them to the list in the first post. Blaster boxes contain 5 packs of 6 cards each. There are two retail exclusives: a Ready to Jam insert set and a Neon Blue Parallel base set.
Upper Deck is selling these for $24.99 with a limit of two per household. I don't see these at Blowout but its competitors have them priced at $39.95. I can't find listings at Target or Walmart but Walmart has a third party seller offering boxes for $42.99.
According to
Cardboard Connection, hobby boxes don't go on sale until February 9, 2022.