All credit goes to from another post.
1. Go-to Samsung.com and look up the Galaxy S9 $799, select the 256GB free upgrade
2. Scroll down to Trade-In and find "Other Smartphone" under Samsung/Google/Apple for $200 off.
3. Make sure the free keyboard is added
This deal works because of the "Other Smartphone" Trade-In which can literally be any old phone. This promo only seems to be available on the S9. I used an old Galaxy Prime that’s over 10 years old.
https://www.samsung.com/us/tablet…710NZA
EDIT: Free Keyboard no longer available