Amazon offers Prime members the Philips Norelco 3500 Series Beard and Stubble Trimmer, model no. QT4014/42, for $24.99. Clip the $5 off coupon on the product page to cut it price to $19.99. With free shipping, that's tied with our mention from two weeks ago as the lowest total price we've seen and a current low by $15. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.37.) It features 20 built-in length settings and self-sharpening Titanium blades. It purports to run for 90 minutes of cordless use after a 1-hour charge.
Note that it won't be in stock to ship for two weeks.