This isn't really on topic for mainland, but Dust has vendors you can buy.
Caspervend I had trouble with, the items are no copy and the last one of an item wouldn't deliver.
The free sell scripts from mystory also break a lot.
I bought the vendors from Dust, and they don't seem to break. I bought the 500L one.
But I honestly feel safer with the signs I made that link to my marketplace. So I put up like a url giver and it just leads to mp. So many in-world vendors broke on me and led to a bad customer experience. I love having an in-world cafe and hangout, but I sell the stuff on marketplace.