In general all the normal holiday foods - meats- whole Turkey and Breasts, Hams, Rib Roasts and desserts pies (pumpkin tends to make my freezer, since it's not readily available during the rest of the year)
But slightly more survival related always have the canned holiday foods on sale - like many canned vegetables and broths. Big jugs of peanut oil - for deep fried turkeys - sometimes goes on sale after the holidays (not as much as they used to). Boxed potato flakes - useful all year - for mash, soup thickener, use as a fried food coating (test for frying... some disintegrate...they're dried mashed potato which is "flaked", versus flakes of actual potato).
Not a food, but the turkey cooking bags and big heavy duty foil pans are a great buy after the holidays and i used them during the year.
Cheap plastic/Styrofoam holiday plates in solid white, green, red of different sizes make excellent targets.