Hello fellow lefty. What do you use to write on paper these days? I've got the last remaining good Bic Reactive pens stashed at work, but I don't think I can get any more.
I buy boxes of Uni Jetstream 0.5mm (black) pens, they're really great (major problem being I put them in my pocket so they tend to travel between bags/desks). just the right feel for my left hand.
I usually carry around a Pilot G-2 these days. I've been pretty happy with them and they're easy to find in stores when I need more. In general, I'll favor a gel pen with fast-drying ink.
Pentel EnerGel Liquid Gel Ink 0.5(Made in Japan) is the best left friendly pen I have used to date, ink dries instantly so no lefty smudge. The sharpie pen is a close second.