Amazon has 4-Count Gillette 5 Men’s Razor Blade Refills for $5.30 when you ‘clip’ the $4 off coupon located under the items price and checkout via Subscribe & Save (select the later date from the “First Delivery On” menu). Shipping is free with Subscribe & Save .
Note, the 4-count is in stock on March 17, 2020. You may cancel Subscribe & Save any time after your order ships. Coupons are typically one-time use.