Barnes & Noble's new e-reader, Nook GlowLight, is available in its retail stores and online starting Wednesday for $119, the same as the standard model of Amazon.com Inc.'s Kindle Paperwhite reader. At 6.2 ounces, the GlowLight is 15 percent lighter than the Paperwhite. It's also ad-free, while Amazon charges $20 more for a Paperwhite without ads on its screensaver or home screen.