Yueshico Stainless Steel Watermelon Slicer Knife Watermelon-fans will adore this Yueshico Stainless Steel Watermelon Slicer Knife ($11), which comes with an automatic cutter blade that produces the delicious cubes you'll enjoy eating. Image Source: amazon.com Yueshico Stainless Steel Watermelon Slicer Knife $11 from amazon.com Buy Now