It seems like the cancelation effect has taken hold with X-23's numbers seemingly dipping further. This does pan interesting though as they still remain above the 20,000 threshold that normally determines cancelation and this isn't factoring in subscriptions, foreign sales, or digital. Looking at the chart, X-23 looks like the highest selling title out of the titles marvel has canceled. It's also roughly still on par with Avengers Academy and selling higher than the still continuing Thunderbolts among others.
This just makes me wonder ever more as to why X-23's title was canceled. A question that hangs without an honest answer while we have essentially a dead month with no X-23 stories in April.
X-23 v3 #21
Cover Price: $2.99
This issue was ranked 90 out of 300 according to ICv2 which is based on Diamond U.S. to comic specialty stores. The issue has sold an estimated 20,281 copies to them.
Disclaimer: These numbers do not factor in digital, foreign sales, subscriptions, or any other avenue of release her title may have.