The vanilly extract in Mexico is known for often being fake, so be careful.
If you want REAL vanilla you have to go to Tahiti and get fresh vanilla beans - you will be in vanilla heaven.
I think you can also find them in Grenada and maybe even farther north. If you find fresh ones they are really nice and not cheap - often $5 to $10 apiece (they are very hard to grow).
I am the editor, but I also speculate, ask questions and play devil's advocate. I reserve the right to change my mind.