DAB Unlimited via Amazon offers Prime members the Natrol Melatonin 5mg 300-Count for $9.95 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping adds $5.46.) That's $3 under our March mention and the lowest total price we've seen. (It's a current price low for this quantity by $13.) It purports to helps reduce anxiety and promote sleep.