Hola TravelChinaGuide- Great and informative site! Do you have an office in Mexico City?

Do you help with processing a visa for China? I live in the Cancun area of Mexico, but it is not convenient for me to go to Mexico'City. I have a valid USA passport and a valid Mexican Residency Card. My travel plans have been made through another company (before I knew about you!) and I have the information about the necessary Invitation Letter. Please let me know if you can help with the Chinese Visa. Thanks.............Mary