Borders Group Inc., the unprofitable bookseller, is entering the digital-book market with an e-reader more than 40 percent less expensive than devices from Amazon.com Inc. and Barnes & Noble Inc. The retailer began taking orders today for Kobo Inc.’s $149.99 digital-book reader, the company said in a statement. Amazon.com’s Kindle and Barnes & Noble’s Nook sell for $259. The device will be delivered in June. It will be sold in stores in August. Borders has a 20 percent ownership stake in Kobo, Mary Davis, a spokeswoman, said by telephone. “They are certainly trying to break in with a lower-cost reader,” Michael Souers, a New York-based analyst for Standard & Poor’s, said in a telephone interview. “It’s their only hope, because they are facing competition that is already entrenched.” – From Business Week