Stores will also try to coax an unplanned purchase from a shopper's planned purchase, a common ploy at electronics chains. Brent Shelton, a spokesman for money saving shopping site FatWallet.com, tells DailyFinance, "Electronic accessories such as cables, as well as extended warranties, are two common up-sells."
"At many electronics stores, if you're purchasing a big-ticket audio-visual item like an HDTV, computer or home theater system, one retail tactic is to try to get you to buy over-priced audio-visual cables -- HDMI, USB adapters, connectors, Monstercables, etc. -- [as well as] speakers, remotes," he says.
These stores also push shoppers to buy extended warranties, which consumer advocates say are mostly a waste of money for a variety of reasons. For one, products rarely break within the extended warranty period, but instead after they've long expired.
What's more, "many credit cards will extend the warranty just for using their card," Shelton says. "And you should find out before swiping a big ticket item at the register."