This is the information with regards to NGK spark plugs ... Made in 
Japan.

BP5EFS .......8,940 ..... @ US$0.88 each
BP4EFS ...... 6,579 ..... @ US$0.88 each
AP4FS  ......30,389 ..... @ US$0.96 each
BPR5EFS ..... 9,403 ..... @ US$1.07 each

Can place these plugs at any Mexican port (land or sea).