Bringing back wood from Mexico
While I cannot name a turner in the Mazatlan area, I am the fortunate recipient of lots of nice mesquite and encino (type of oak) from the the mazamitla area. I am fortunate to work with a group of hispanic gentleman and we have all been friends and associates for many years. I am teaching one of them to turn. Annually he revisits family, south of the border, and returns with a load of nice size mesquite rounds and half-rounds. FOB the door, you have to love it.
I would suggest that maybe you inquire with AAW directory members, if any in the area about suppliers and arrange to have the wood shipped home. No idea on cost but much easier than dealing with airport security. I am sure they think bocote of WMD.
I just love the mesquite from that area, beautiful color and very dense. It is a pleasure to turn but wear a mask. Sometimes, some of them are grub houses and things get a little messy if I do not deal with that problem but the borer holes add a lot of character. I hope you find what you are looking for but I do not think you will find it in prepared block formats so be prepared to deal with "native" woods.
Good luck.