Amazon offers Prime members the Rugged Blue Polycarbonate Diablo Safety Glasses in Gray, model no. SC-260, for $1.97 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, shipping adds $5.03.) That's the lowest total price we could find by $2. They feature a scratch-resistant finish and meet or exceed ANSI Z87.1 and CE EN166 standards.

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