Sony said Thursday that it will offer subscriptions to The Wall Street Journal and New York Post on its new electronic reader. In addition, Sony will offer a daily summary of news for owners of the e-reader. Sony will be the exclusive seller of the Post’s digital edition, which is expected to launch in January. The move by the two News Corp.-owned newspapers underscores the rising competition to Amazon’s Kindle device, which has dominated the market for newspaper and magazine subscriptions on e-readers. The Journal also offers subscriptions through the Kindle. Sony said the Journal will cost USD 14.99 a month for its digital edition. A subscription to MarketWatch news and columns will cost USD 10.99 a month. The Post subscription will cost USD 9.99 a month.