Return One Item Get One Free

We're down to the final days of holiday shopping frenzy.  Your favorite store is running a special on Christmas sweaters, buy one get one free, so you purchase one each for your favorite twin nephews.  Unfortunately you find out later that they no longer think it's cute to dress identically so you bring one of the sweaters back.  Of course you're not expecting that the store will refund you the full purchase price and let you keep the other sweater for free, are you?  (a "we're giving away free sweaters" promotion).  You might, if you live in California and other states that require stores to provide a "full" refund of the purchase price unless they provide notice to the contrary.  Toys R Us has just settled a class action in California that alleges that the Company violated California law by not providing a full refund for items purchased with discounts or through specials like buy one item get another item for 50% off.  Retailers who don't want to end up running even