For the first time, Wal-Mart Stores Inc. is offering free shipping on what it considers the season's top 100 hottest gifts, from board games to items related to Disney's hit film "Frozen" items, starting Saturday. Wal-Mart unveiled some of the details of its holiday strategy as it considers matching online prices from competitors such as Amazon.com, a move that could help grab more customers but could also hurt profit margins. The Bentonville, Arkansas-based discounter has matched prices of local store competitors but has not followed other retailers including Best Buy and Target in matching prices of online rivals. Wal-Mart is trying to rev up sluggish sales in the U.S.