They only appears at some point in the day.
You can find them in Dustridge, Rusty Valley, and in Whellcum.
Viewing post in How do you find the street vendors
Apparently there must be more buttplug purchases either to add in our vault or to try on, as 3 of Hanth's made cockrings are missing matching buttplugs. Should I hope for a "spoiler" reply on this topic, please?
PS: Great work, guys, I love this game and can't wait to see the next early access or final released version of it. Hope more in- and out-Whellcum village places would be added for "essential" expeditions, as well as more affinity stories in Whellcum :-)
Thank you, asieo!
FYI just in case you need to know, I found out this: https://itch.io/t/1149371/after-game-ending, leading to this: https://trello.com/b/8W9hyU6X/rma-roadmap