X-Men Worlds Apart #1 $3.99 Marvel 31,230
X-Men Worlds Apart #2 $3.99 Marvel 21,515
X-Men Worlds Apart #3 $3.99 Marvel 23,925
X-Men Worlds Apart #4 $3.99 Marvel 22,146
Sales figures are just for the debut month additional sales are not included, unless stated otherwise. Source