Don't trash those unused gift cards. You can buy, sell, or exchange them on these sites. Have you received a gift card as a ...

Despite your best intentions, it can be difficult to get everyone in your circle a perfect – or at least personal – gift.

Know the rules, then use them fast: Balances last 5 years; inactivity fees after 12 months; some states cash out small leftovers (e.g., CA $10) Buy low, sell smart: Warehouse clubs = easy 20% off; ...