50-Count Disposable Face Masks (Blue, Various Brands) $2.49 + Free Prime Shipping

All are Shipped / Sold by Amazon and $2.49 at the time of posting.
Available Brands:

• Dongli Technology $2.49 – expired
• Winner Medical Co., Ltd (Style 1) $2.49
• Winner Medical Co., Ltd (Style 2) $2.49
• LeadPro $2.49
• Basic Resources (Style 1) $2.49
• Basic Resources (Style 2) $2.49
• Sismate $2.49
• R-Collar $2.49
• Master Medical $2.49
• CKW $2.49
• Seniorwear $2.49

These prices are $0.50 less than the next lowest priced options (priced at $2.99) I could find with Prime Shipping at the time of posting.