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Amazon [amazon.com] has 5-Count Uni-Ball 207 Signo 0.5mm Micro Point Retractable Gel Pens (Black) for $3.79 – 5% when you checkout with Subscribe & Save = $3.60. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]Fraud-resistant ink bonds with paper to help protect against check washing, water, fading, and document alteration[*]Delivers bold, smooth, skip-free, smear-resistant writing