There is an excellent map of Mexico and parts of Belize and Guatemala sold in Lotte stores (like a 7-11) throughout Mexico although you may have to ask for the Mexican altas for version if you want the complete version. Local stores sell detailed local maps. Wouldn't worry too much for the rest of central america because any good guidebook has enough to get you to Panama.
In Colombia the sell a road guide in certain stores and at all toll plazas.
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