Thumb Score: +1

Amazon [amazon.com] has Remington SPF-300 Screens and Cutters for Shavers F4900, F5800, and F7800, Silver on sale for 10.53 or less when you checkout via Subscribe & Save. Shipping is free while Subscribe & Save is available.

These shaver blades fit the F5-5800 shaver that hits FP every year for ~$ 20.