The person who sells paper and writing utensils is a stationer and works in a stationery store.
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He is a "stationer "
At a post office or at a stationer's.
Stationery
stationer
A stationer would prominently display items such as innovative writing instruments, high end cardstock and business card designs on a point of purchase display.
The person is a stationer, selling stationery.
A person who sells stationary is typically called a stationer or a stationary store owner.
A stationer is the person who sells them, a stationery store is where they are sold.
The articles usually sold by stationers, as paper, pens, ink, quills, blank books, etc., Belonging to, or sold by, a stationer.