In the below video, Motley Fool analyst Blake Bos discusses recent holiday sales data that could spell trouble for struggling retailers Best Buy (BBY 1.15%), RadioShack (RSHCQ), J.C. Penney (JCPN.Q), Sears Holdings Corp. (SHLDQ), and GameStop (GME -1.14%) . Along with this new data, it's important for investors to take any holiday sales numbers with a grain of salt, as they can be watered down with promotions. These promotions can translate into razor-thin profit margins and mislead investors in the short term. Blake covers what the holiday season could mean to these retailers and also reveals his pick for the best stock of the group for 2013.