21-Count 1-Oz Doritos Tortilla Chips Variety Pack $7 & More

Amazon has 21 × 1oz Doritos Flavored Tortilla Chips Variety Pack & More for $13.99 - 50% when you 'clip' the coupon on product page = $7. Shipping is free with Prime or on $35+ orders. Looks like price mistake. Promo page says "Buy One, Get One 50% off", but price is 50% off for one. List of other items in this promo (Some combine with 15% off S&S).