Amazon has Nature’s Bounty Super Strength Melatonin, 5 mg, 90 Softgels for just $4.73, a "Best Price" per CCC.
Add-on item: ships free with $25 orders or on your Amazon day.
https://www.amazon.com/gp/product/B007V4TAWC/
Excellent customer reviews; helps people sleep!
Also available at Walmart for $4.73 w/ free store pick-up. (I think Amazon is price matching Walmart.)