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Amazon [amazon.com] has Electric Callus Remover, Pedicure kit for Cracked Heels and Dead Skin with 2 Roller Heads for $ 11.99 when you "clip" 40% off coupon code found on product page. Shipping is free with Prime or on order $ 25+.
Features:
Rechargeable 1500mAh Li-ion battery can be used up to 60 minutes
Two speeds of operation- 1600x/min low speed and 1900x/min high speed