You can check their website. They publish a monthly list of the prices of everything they carry, and it shows what's on sale. Also which store carries what brand (not all stores have everything) and how many bottles of each are on hand.
Very true Jill, Not all stores have the same sales at the same time/same week. It's best to check the website. They keep things pretty well up to date also.
Thanks! Your answer is awaiting moderation.