Macy's offers the Martha Stewart Collection Ginger Grater for $5.99. Coupon code "SALE" cuts that to $4.79. Opt for in-store pickup to avoid the $9.95 shipping charge. That's $5 off and the lowest price we could find, although it was a buck less last July. It can be used for grating ginger, spices, wasabi, horseradish, and hard cheeses.