It's not uncommon for stores to have sales - especially around "holidays". They have Valentine's Day sales, President's Day sales, 4th of July sales Summer Solstice sales, Winter Solstice sales ... my Grandma made a poop without prunes sales! And, when they get overstocked on certain items.
The biggest usually start with the pre-thanksgiving sales ... after that you get the pre-Christmas .... and the end-of-year after Christmas but before new years day sales.
If you want to know what the monthly specials from a particular store are - you'll just have to spend a few months watching what they put on sale. I know I got some AC multi-cookers from a website a few years ago that have not been that cheap again.
"It ain't what you don't know that gets you in trouble. It's what you know for sure that just ain't so." - Mark Twain