$54.99 From 1 to Pen Reviews: A Student's Guide to Gel Ink and Ballpoint Pens: Review: Uni-ball 
Only decent 0.5mm pen I could find. Why is majority of pens 0.7mm? : pens
PIL31105 : Pilot® Pilot G2 Retractable Xfine Gel Ink Rollerball Pens - Extra Fine Pen Point - 0. 
