If you're looking for some great SF & F titles by women, Humble Bundle's got you covered with books published by Open Road Media. As with their other bundles, pay a certain amount to unlock DRM free ebooks in multiple formats.
At $1+ you get Parable of the Sower by Octavia Butler, Wylding Hall by Elizabeth Hand, Jaran by Kate Elliott, and Path of Fate by Diana Pharaoh Francis.
Pay $8+ and you also get Parable of the Talents and Wild Seed (Octavia Butler), Sunshine (Robin McKinley), Black Light and Saffron and Brimstone (Elizabeth Hand), Skeen's Leap (Jo Clayton) , Lammas Night (Katherine Kurtz), and Skin Folk (Nalo Hopkinson).
Finally, for $15+ you get all the above plus Octavia Butler's Unexpected Stories, Robin McKinley's Beauty and The Hero and the Crown, Katherine Kurtz's Camber of Culdi, Pamela Sargent's The Shore of Women and Jane Yolen's Sister Light, Sister Dark.
Want to learn more? Check out the site.