Panasonic offers its Panasonic Hair & Beard Trimmer, model no. ER-GB40-S, for $49.99. Coupon code "WOOTMEN' cuts it to $29.99. With free shipping, that's the lowest total price we could find by $15. It can be used either dry or wet and features an adjustable shave dial and rechargeable battery.
Update: Note that this item is currently on backorder, but can still be ordered at this price for delivery when available.