Believe it or not, Kmart.com still exists in 2020. They are down to ~60 different LEGO sets in stock. I received an email today giving me $15 on a $100 purchase, plus there is a $10 back on $40 promo. Some sets have long since retired. Minecraft 21136 Ocean Monument is going for close to $200 FBA right now, and can be had for ~$110 after shipping, tax and freecash (before any points you might have), with $11 back in points. Not a lot of margin yet, but if you have more points to burn this might be of interest.
No guarantees on the condition of the set once it arrives - haven't ordered from them in almost a year (since they closed all their stores in a 100 mile radius from me).