Senshi from Delicious in Dungeon is pretty close.

Wait, why not make her a character who puts up stalls inside the middle of the dungeons (rest stops or whatnot) and makes sure to stock up on necessities adventurers might have missed. Herself being self-sufficient (she’s had lots of experience), or has a partner who has the same hobby.

She has very competitive prices–just a small markup for her troubles. And has become an urban legend amongst adventurers as “granny mart”. Some rely on her foot cream, others for her home-cooked meals, and still others for her effective home-made potions.

takes notes

I made half elf once who outlived her human husband and one day said: “Fuck it! Ma granbabies gots babies. The family’s got things under wraps here. I’m off t’find a‘venture!”

She got Strahded and never exited the Death House.

You could have a group of monsters hiding in the shadows just past Granny Mart, who get very confused when the adventurers finish shopping and leave.

It turns out that Granny’s health potions just taste so much better than the others.

“My my, this old temple is a mess! Who’s going to clean this up?”

Scene cuts to a bunch of kobolds scrubbing the floors and taking out wrecked furniture while happily munching on home-made cookies.

In my head, there’s more than one of them, they’re a group of retirees who chose this method of funding and enabling their ability to tick off their bucket list. They can be NPCs or DMPCs depending on the situation, and explains away the JRPG trope of the merchant in the last boss dungeon. The merchant turns out to be a retiree choosing to set up shop in the middle of their own adventures.

Little did Granny know that a component of her home-made potion is both delicious and addictive.

This is basically Granny Weatherwax and Nanny Oog.

“Can’t be havin’ with this barbarian nonsense!”

“I could be havin’ with his nonsense…”

“Gytha!”