the Poshmark app has a thriving "community":
Shameless plug:
poshmark.com/closet/masongodley

Others that inspired mine:
https://poshmark.com/closet/diego_trejo69
https://poshmark.com/closet/skaterdick80
https://poshmark.com/closet/ry025
https://poshmark.com/closet/dive7mmwet

@ckslad:

discretely of course. ebay seems hit and miss.