You can plan on it every year. Toward the end of February to early March. All of the feed stores do it. They call it "Chick Days"!!! I anxiously await that time of year ever year. Yes, I do hatch eggs of my own and yes, I do sometimes order live biddies from a hatchery.
There's nothing more fun than walking into Tractor Supply or some other farm/feed store and hearing the "cheap, cheap, cheap" of brand new baby biddies! When I hear that, I am SUNK!