The shopping apps are an attempt by brick-and-mortar retailers to hook shoppers like Stefanie Scott of Greenfield, Wis., who plans to spend $1,000 to $2,000 on gifts this year.Scott starts her holiday shopping by checking out deals on Facebook. Then, she brings her smartphone along on shopping trips and uses mobile apps to get discounts once she's in the store. She's also a fan of offers to buy online and pick up in the store, and recently used one at Best Buy to buy a videogame for her brother-in-law. "I'm tied to my cellphone," she said. "Coupons and lists get lost in my purse. It's so much easier when I'm shopping to whip out my cellphone and have them scan it. The more I can do on my iPhone, I'm all for it."