Stores that are planning to close after Christmas are still selling the cards through the holidays even though the cards will be worthless January 1. There is no law preventing them from doing this. On the contrary, it is referred to as 'Bankruptcy Planning).
Below is a partial list of stores that you need to be cautious about.
Circuit City (filed Chapter 11)
Ann Taylor 117 stores nationwide closing
Lane Bryant, Fashion Bug ,and Catherine's to close 150 stores…
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