you can also earn them through purchases as detailed in your CVS weekly flyer
i.e. if you buy abc item at X dollars, we give you Y back in ECB's, therefore, the product only costs x - y.
The trick then is to "roll" them over. Meaning, you use those ECB's dollars to purchase an item, but an item (or items) that give you more ECB's. Check out the CVS forum for peoples posts on how they are "rolling" their ECB's.
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