I have just ordered some Bic M10 ballpoint pens. Man, I have used many of these in my life.
It's funny to me that one of the cheapest pens on the market is also (to my taste) one of the best. I have tried a lot of different pens in many price classes, and I've found nothing which writes smoother and more pleasant than this bulk item. (Not to be confused with other Bic pens.)
I suspect it's because almost all other pens, for lord-knows-what-reason, have too small points. They dig into the paper and makes the writing less smooth. But this one is a pleasure to use.
I prefer the black and red ones. I have even used them for drawing. The black is pure, deep black, and the red is pure, deep red, like blood. Other red pens tend to have a too light, too orange-ish color.
About ballpoint pens: If not used for a while, they can block from dried ink. A good tip is to warm the tip (uh) with a lighter, that softens the ink.