How many P-40's are left?

It’s been a while since New Zealand wasn’t on that list (recent exports to AU and USA). Multiple projects underway however.

Well in excess of 150 extant airframes and substantial remains.   

https://www.goodall.com.au/warbirds-directory-v6/curtiss.pdf

 The flyers ?

There are 34 P-40’s flying in the world: (May 2024) 
Australia: 5 (41-25109, 41-25158, 42-14112, 42-104687, 42-104986)
Belgium: 1 (41-13570)
France: 1 (42-105915)
United Kingdom: 3 (41-13357, 41-19841, 42-104721)
United States: 24 (AK295, AK827, AK905, AK933, AK940, 41-35918, 41-5709, 42-10083, 42-10256, 42-104730, 42-104827, 43-5508, 43-5795, 43-5802, 43-5813, 42-104977, 42-105120, 42-105192, 42-105306, 42-105861, 42-105867, 42-106396, 44-7369, 42-105875)

—–Purposely not included: AK752, of the Jim Smith collection, which is no longer flying. 42-9733 is being rebuilt by the Schroeder family. P-40E AK753 (N4420K) was severely damaged in a fatal accident on June 27, 2023. The Flying Heritage & Combat Armor Museum’s P-40C 41-13390 hasn’t flown since at least 2019. P-40B 41-13297, belonging to the Collings Foundation, is now indefinitely displayed static at their American Heritage Museum. Kermit Weeks’ TP-40N 44-47923 hasn’t been flown in recent years.
 

Just to answer the question, there are probably more than 40 P-40s left judging from the list of surviving P-40s in the link below:

https://en.wikipedia.org/wiki/List_of_surviving_Curtiss_P-40s