Amazon offers the Sennheiser HD 202 II Professional Headphones for $18.98 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping adds $5.58.) That's a buck under our November mention and the lowest total price we could find by $5. These headphones feature semi-circumaural earpads, 3.5mm and 6.3mm connectors, a frequency response of 18Hz to 18kHz, and more.

Note that it's currently backordered, with an estimated ship date of January 18.

Amazon Prime membership is $79 per year; however, Prime is free for college students for six months, and free for parents and caregivers for three months. (Note that currently there's a waitlist for Amazon Mom.)