Amazon offers the Mars Chocolate Favorites Halloween Candy Bar 250-Piece Variety Pack for $19.95. Clip the 20% off coupon on the product page and add it to your cart to drop it to $15.96. Plus, Prime members bag free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping adds $1.99.) That's $4 under what you could expect to pay at a local store. It comes with Twix, 3 Musketeers, MilkyWay, and M&M's.

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