Woot offers Nisaku NJP650 The Original Hori Hori Namibagata Japanese Stainless Steel Weeding Knife for $8.99 (orig. $29). Free shipping for Prime Members.

Product Description:
The Nisaku Japanese Stainless Steel Weeding Knife boasts both straight and serrated edges that's useful for dividing plants, planting bulbs, flowers and herbs, digging out weeds, removing rocks, cutting through roots and so much more! A comfortable wooden handle allows for a good grip for all-day digging, and ensures you push into the soil with more control. Comes with a faux leather sheath. 

• QUALITY: Made in Japan with the finest stainless steel.
• EASY MEASUREMENT: Inch markings on the blade will ensure your plants and bulbs are planted at just the right depth.
• MULTI-USE: Both serrated and straight edge blades, and is a fantastic gardening, landscaping, and camping tool.
• DURABILITY: The blade is rust and scratch resistant, and stays razor sharp.
• ERGONOMIC: Blade Size: 7.25 inches; Handle Size: wood, 5.25 inches; Weight: 10 oz.