How to prop up Christmas shopping at a time of stubbornly low retail sales? At Wal-Mart this holiday season, the stimulus is called Justin Bieber. The retail giant is betting on the teenage Canadian pop superstar to help lure customers (especially young, female ones) with a host of exclusive Bieber products. That includes “My World,” a new unisex fragrance named after the title of Bieber’s debut release. The perfume comes in four scents, priced at $14 each, as well as scented wristbands and dog tags. Another perk for fans will be a line of Bieber-designed Nicole by OPI nail polish. Both products will be available in the next few weeks—and will hit Wal-Mart shelves first. In another exclusive deal with the retailer, Bieber told followers on Twitter (they number 5.6 million) to look for his new acoustic album at Wal-Mart on Nov. 22, a day ahead of the general release.