Amazon offers its Prime members the PermaFLOW PF-07001 Never-Clog Drain
, model no. PT5021, for $19.99
with free shipping
. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $5.40.) That's tied with our February mention and the lowest total price we could find by $5. It features an integrated wiper with external knob, bypass option, adapters, and more.
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.