Yichengjin via Amazon offers the Soufull Professional Knife Sharpener for $15.88. Coupon code "knsh1037" cuts it to $10.37. Plus, Prime members bag free shipping. That's tied with our mention from two weeks ago and the lowest price we've seen. (It's the best deal now by $8.) It features a 2-stage sharpener (coarse and fine) and non-slip base. Deal ends January 31.