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Amazon [amazon.com] has 12-Ct Gillette5 Men’s Razor Blade Refills for $ 19.91 – 5% off when you checkout via subscribe & save – $ 3 off when you clip the coupon on the product page = $ 15.91. Shipping is free w/ Prime or on orders $ 25+.

Note: Coupons are usually limited to one per account.