Sonys giving up on its own ebook store in favor of going with a competing store from Kobo — at least in North America. The two companies announced a deal today that marks the end of Sonys store in the US and Canada on March 20, and that will send existing customers to Kobos app on Sonys Reader and Xperia devices. Sony says that existing books will be transferred over as part of the changeover, and that its customers will be able to download those titles through April 30. The move comes as Sonys making big changes to its consumer electronics plans.