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From my experience with paint pens in the past, I had touched up spots on my Audi still good after 10 years.
The pens keep a long time - 5 years maybe. Keep them on their sides, cap on tight, in a ziplock. Shake vigorously before using. The tips, not so much. Maybe get a few uses out of a tip before you need a new one.
Have one of the service guys order one for you and pick it up. That's what I did at the Portland service center when I had my second charger installed.
It is, though I find that the shipping amount is the same whether you order one item or five. I tend to wait and buy a few things at once - a couple paint pens and a few mobile charger adapters this time around. Still just $9 for them all.