How much are dental crowns in Mexico?

Depends anywhere from 300$ if you go to the boarder with cheap not so great dentist to 600$ for dentist who "think they are the best in Mexico"

I've had all my family go we actually found a great affordable dentist in Cancun, who is licensed and trained in the U.S.A her name is Dr. Irma Gavaldon here is her website if you are interested dentalworkmexico.com