Almazán Percusión is in Coatzintla, Veracruz-Llave; Cajones Peruanos CR is located in Juárez, Nuevo Leon; Drum Box Percusion is located in Mexico City; Joca Percusivo is located in Guadalajara, Jalisco; Lomax Percussion is in Los Mochis, Sinaloa; nnd Cajon is located in Lumbreras, Aguascalientes; Yepa Percusion is located in León, Guanajuato.
YouTube playlist of cajons made in Mexico:
Note that not all manufacturers have current YouTube videos. The list on this page includes websites and Facebook pages which may contain videos not on YouTube. The list on this page is current and actively maintained, the YouTube playlist is less frequently updated.
Listed above are links to the cajon drum builders in Mexico as retrieved by Internet searches in March 2018. I am sure there are many others not listed. Please send me updates and correction if you have additional information. Thanks.