The two major LDS bookstores are Deseret Book and Seagull Book and Tape. Most of the stores are found throughout the western United States, including Utah, Idaho, Arizona, California, Nevada, Colorado, New Mexico, Oregon, and Washington. These areas tend to have a higher populations of Latter-day Saints.
Most LDS bookstores carry LDS scriptures, books written about the Church mostly by Church members, fiction books with stories geared toward the LDS faith, pictures, paintings, LDS themed games, idea books for LDS oriented activities such as Family Home Evening and Mutual, cookbooks, jewelry like CTR rings, music and stickers.
Although LDS bookstores specialize in books focusing on religion, that is not all they stock. Many of them also provide uplifting and inspirational books, pictures and other items that are not necessarily just for Mormons.
Short list of LDS bookstores online: