Most codes don't actually expire that fast - the real issue is they're often store-specific or tied to minimum purchases, so you need to check the terms before getting excited. Dedicated coupon sites like RetailMeNot, Honey, and Rakuten are solid starting points, though I'd verify any code actually works before committing to checkout since some get listed but aren't active anymore. Browser extensions that auto-apply codes are handy, but double-check the final price since occasionally they stack discounts incorrectly. The best bet is honestly just checking the store's own promotions page first - sometimes they advertise codes right there without you hunting anywhere.