Amazon offers Prime members the Amope Pedi Perfect Electronic Foot File, Pedicure, and Callus Remover, model no. ASA-142, bundled with a $10 Amazon Gift Card, for $36.84 with free shipping. (You must add both items to your cart to get this deal. Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $5.48.) Assuming you'll use the credit, that's the best deal now by $9 and the lowest total price we've seen. It purportedly buffs away rough, dry, and hard skin in seconds and requires four AA batteries (included).