The best Mexican knives that I have bought were Mexican Bowie knives. There are a lot of cheap ones out there so you have to avoid the regular tourist shops. I got a nice one from a knifemaker with a stall in the primary mercado in Guadalajara, but that was many years ago. If Don Luis reads this thread he could probably make a much better suggestion. Mexican Bowie knives typically have an eagle head on the pommel and horn or stone grips. The blade is likely to have more curves than a US made style.