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Amazon [amazon.com] has 24-Ct Paper Mate InkJoy 300RT Retractable Ballpoint Pens (Black) for $6.38.
Shipping is free with Prime or on $35+ orders.

Walmart [walmart.com] has 24-Ct Paper Mate InkJoy 300RT Retractable Ballpoint Pens (1.0mm Medium Point, Black) on sale for $6.52. Shipping is free with Walmart+ (30-day trial for $1 [walmart.com]) or orders $35 or more.