Visitors chat next to the Ebay logo at the CeBIT computer fair in Hanover March 2, 2011. REUTERS/Tobias Schwarz EBay said it plans to buy e-commerce company GSI Commerce, which owns Web businesses such as the flash site Rue La La and ShopRunner, for $2.4 billion. Ebay said it will offer shareholders of GSI $29.25 per share, a 51 percent premium over its closing price on Friday.