As one of its daily deals, Best Buy via eBay offers the Panasonic Wet/Dry Nose and Ear Hair Trimmer, model no. ER-GN30-K, for $9.99 with free shipping. (Amazon has it for the same price with free shipping for Prime members.) That's the lowest total price we could find by $1, although we saw it for $1 less in December. It features a dual-edge blade, Vortex water cleaning system, and requires one AA battery (not included).

Update: Shipping has increased to $5.49, so it's best to opt for in-store pickup.