Any time they have discounted meats on sale lol
I don't think the grocery stores have a specific time of day where they sale discounted meat. Why don't you go ask your grocery store?
I buy preseasoned meats from Albertsons in the offseason because I can get packs of pork chops and chicken two for one! They season them because the meat is about to go bad, but if you buy it and cook it right away and consume in a week your fine.
If you have questions regaurding your grocery store go ask them...how in the heck are we supposed to help?