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Amazon.com has uni-ball uniball Vision Rollerball Pens with 0.7mm Fine Point, Blue, 12 Count for $9.57 when you check out w/ Subscribe & Save.
Shipping is free with Prime or on $35+ orders.

https://www.amazon.com/dp/B00006IE8K?th=1

Alternatively, uni-ball Corporation via Walmart [walmart.com] has 12-Count uniball Vision 0.7mm Fine Point Rollerball Pens (Blue) for $10.07 – $1.06 when you clip the coupon on the product page = $9.01. Shipping is free w/ Walmart+ (30-day trial for $1 [walmart.com]) or on orders of $35+.