Yichengjin via Amazon offers the Soufull Professional Knife Sharpener for $13.99. Coupon code "knsh1037" cuts it to $10.37. With free shipping for Prime members, that's tied with our mention from two weeks ago and the lowest price we've seen. (It's the best deal now by around $10.) It features a 2-stage sharpener (coarse and fine) and non-slip base. Deal ends August 31.