Flents Quiet Time® Soft Comfort Ear Plugs (NRR 33), Made in the USA (70 Pair) - Walmart.com
E-A-R Soft Blast CORDED Foam Ear Plugs (NRR 33) (Box of 200 Pairs) - Corded Industrial Foam Ear Plugs in Full Boxes
Don't Go Deaf — Get a Supply of NRR 33 Earplugs « Daily Bulletin
Amazon.com: HEAROS Xtreme Ear plugs - Best In Class Noise Cancelling Disposable Foam Earplugs With NRR 33 Hearing Protection, 14 pairs : Health & Household