I know alot of independant studios who sell alot or sell out at their local anime or fan conventions. They get a tiny booth and sell there. Either normal stuff or adult stuff.
With my disability its not doable.
But I did have the local and only Anime shop in my city. Which has been around for over 20 years say he could sell my manga and even my illustrations. Id want to redraw my manga first before I do that. (need an income first to hire someone) And have enough variety for illustrations first.
Some sell on Amazon and Etsy too.