Below shows sandbox availability for P1 and P2 Orgs (MLS/SW/STR/311 ECRM).
As of Sep 1, 2022, P1 org has 40 Developer sandboxes made available (39 in use, 1 available).
As of Sep 1, 2022, P1 org has 40 Developer sandboxes made available (33 in use, 7 available).