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uni-ball Roller Rollerball Pens Fine Point Micro Tip, 0.5mm, Red, 12 Pack for $ 2.25
These usually go for about $ 10 a dozen. Cheaper if you buy 2 or 3 at the same time
Amazon – uni-ball Roller Rollerball Pens Fine Point Micro Tip, 0.5mm, Red, 12 Pack – $2.25