In New Atlantis, Starfield, you can sell items at several key locations:

• Trade Authority : This is one of the best places to sell items, especially if you have contraband or stolen goods. The Trade Authority has a kiosk next to the spaceport's ship services technician and a main shop located in The Well district. The shop in The Well is recommended for selling large quantities or contraband items face-to-face with the merchant there

• Jemison Mercantile : Located in the spaceport area, this general store buys and sells a wide variety of items including weapons, gear, ammo, and resources

• Other Vendors in New Atlantis : There are multiple vendors spread across the districts of New Atlantis (Spaceport, Residential District, Commercial District, and The Well) that buy specific types of goods such as weapons, ammo, gear, aid, clothing, and food. For example, UC Distribution and Outland in the Commercial District, Apex Electronics and Med Bay in The Well, and various shops in the Residential District like CJ’s and EIT Clothiers

For the fastest and most efficient selling, especially if you have a lot of loot or contraband, heading to the Trade Authority shop in The Well is considered the best option. The kiosk by the spaceport is convenient but has a limited sell capacity that refreshes slowly, whereas the Trade Authority in The Well can handle larger transactions without such limitations

. In summary, to sell items in New Atlantis:

• Use the Trade Authority shop in The Well for contraband and large sales.
• Use the Trade Authority kiosk near the spaceport for quick sales.
• Use Jemison Mercantile and other vendors across the city for general goods and specific item types