Swappa - Unlocked Note 9 128gb "Mint"

$280 - $299

https://swappa.com/buy/used/samsung-galaxy-note-9/unlocked?condition=mint

Amazon - Unlocked Note 9 128gb "Renewed"

$244.99 - $299.99

https://www.amazon.com/dp/B07KNB1TN8/

For Amazon, you have to look at all the sellers, not just the one on the main page that Amazon selects for you. They have all labeled their phones as "Like New (Refurbished)".

I believe Swappa includes the shipping cost in the listing.

I'm not sure how Amazon's shipping works without Prime. I believe it's still free if it's more than a certain $$ amount.