Amazon offers its Prime members this 3 Musketeers Fun Size Bars 8-Count 8-Pack
(64 total) for $5.16
with free shipping
. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping adds $6.17.) That's $0.08/bar, $7 off, and the lowest total price we could find for this quantity of this candy.
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 there is currently a wait list for the Amazon Mom program.)