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Walmart.com [walmart.com] has 18-Count Zebra Sarasa Retractable Gel Ink Pens (0.7mm, assorted colors) for $ 7. Shipping is free on orders of $ 35 or more.
Amazon.com [amazon.com] also has 18-Count Zebra Sarasa Retractable Gel Ink Pens (0.7mm, assorted colors) for $ 7. Shipping is free w/ Prime or on orders of $ 25 or more.