How about a new Galaxy S9, S9 Plus or Note 9 for your iPhone X sound? No? What if you get $600 as well? This is the premise of Samsung USA's new promotion. The company will increase its usual trade-in price, even for Apple products, for a limited time.
https://www.notebookcheck.net/Samung-US-is-temporarily-doubling-its-trade-in-payoffs-even-for-iPhones.337618.0.html