New Harbor via Amazon offers Amazon Prime members the Laptop Notebook Cooler Pad with 3 Fans for $4.66 with free shipping. (Non-members can spend over $25 to qualify for free shipping; otherwise, shipping adds $6.76.) That's $15 off and the lowest total price we could find. It's USB powered.

Amazon Prime membership is $79 per year; however, Prime is free for college students for one year, and free for parents and caregivers for three months.