Amazon cuts an extra 25% off a selection of Valentine's Day candy via this clippable coupon. Plus, Prime members receive free shipping on all orders. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it starts at around $7.) Choose from Dove chocolate, M&M's, Snickers, and 3 Muskateers.
Note that some items are only available via Amazon's Prime Pantry program.