Cafago offers the YongNuo YN EN 50mm f/1.8 AF Standard Prime Lens for $52.62. Coupon code "ZD1723MG" cuts it to $44.38. With free shipping, that's the lowest price we could find by $6. It features a 50mm focal length, f/22 minimum aperture, and maximum viewing angle of 46°.
Note: This items ships from China and requires 7 to 20 business days for delivery.