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Amazon [amazon.com] has AmazonCommercial Superior Gel cushion Knee Pads, 9 in, Black, 1 pair for $ 4.50
Shipping is free w/ Amazon Prime or on $ 25+

Product Description[list][*]Superior gel cushion knee pads (1 pair, black) provide extra knee protection; designed to withstand heavy-duty use at home or on the job[*]Exterior cap offers safety, while the soft gel interior ensures cushioning comfort