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Amazon has 5-Count Uni-Ball 207 Medium Point Retractable Gel Pens (Black, 0.7mm) for $3.79. Shipping is free with Prime or on $35+ orders.

Staples also has 5-Count Uni-Ball 207 Medium Point Retractable Gel Pens (Black, 0.7mm) for $3.79. Free store pickup is available where stock permits.