I have been using the Sharpie Extra-Fine Point marker as my primary editorial cartooning pen for over 30 years.
Last year, to my horror, they announced they were no longer going to manufacture it. I immediately began hoarding boxes of them. I'm down to 3 boxes. I can still find them on eBay and such, but it's known they've been discontinued so people are charging exorbitant prices for them. I've been testing markers to serve as replacement and think I've finally found one: the Stabilo OHPen Universal. Yay.