Cullen Family Crest Jewelry: Get official replicas of Rosalie's necklace, Alice's Choker, or Edward's wristcuff, all bearing the Cullen family crest. Individual pieces are available at Hot Topic, and the full set is available for $99.99 at Amazon.
Bella's Engagement Ring: Sure to make girls look at their ring fingers and sigh, this ring is available as a fashion ring ($59.00), fine ring ($549.00), or genuine diamond ring ($2,199.00) from Twilight Teez.
Twilight Books: Stephenie Meyer's guide to the Twilight saga doesn't come out until next year, but a box set of all four books in hardcover is available ($45.65 from Amazon), as is Meyer's latest book, The Host.
Essence of Twilight: Attraction in Twilight is based on the scent of the characters, and the Essence of Twilight products give you the opportunity to smell like Edward, Bella, Alice, or Jacob. Various prices from Etsy.