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Amazon [amazon.com] has 4-Pack 3M ForceFlex Plus Safety Eyewear w/ Scratch Resistant Lens for $ 4.71. Shipping is free w/ Prime or on $ 35+.

Product Description from Amazon[list][*]Durable lenses help provide limited protection from light to moderate impact hazards[*]Contoured design[*]Lightweight – weighs less than 1 ounce[*]Scratch-resistant coating helps keep vision clear[*]Impact-resistant lenses block 99.9% of UV rays