NERF Ultra 75 Dart Refill Pack Compatible Only Ultra Blasters (Black) $10 + Free Shipping w/ Prime or on $35+
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Amazon[amazon.com] has NERF Ultra 75-Dart Refill Pack Compatible Only Ultra Blasters (Black) on sale for $ 9.99. Shipping is free w/ Prime or on $ 25+ or $ 35+ orders (minimum requirement varies by location).