TonerPlus via Amazon offers Amazon Prime members this HP CB436A Compatible Laser Toner Cartridge for $10.99 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $6.29.) That's $7 under our May mention and the lowest total price we could find by $5.

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.