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Go to La Michoacana mexican grocery store/meat market. There are several around town, but I usually use the one on S. Post Oak 4-5 blocks south of the south beltway...down toward Missouri City.
The beef fajita is the "fajita preparada" and the chicken in the "pechuga marinada."
Cook right on top of medium heat like you would cook a steak.
If you are not pleased, I am a monkey's uncle!!
These are the only ones I use any more...way better than the HEB marinated.
If you try it...pm me and let me know if you like them.