1. Buy 4 Kohl's gift cards from Samsung Pay at $40 per $50 GC
2. Buy Nest Thermostat during BF sale for $200 worth in GC purchased from Samsung Pay
3. Use $60 Kohl's cash a week later for something else you want from Kohl's.
Note that this combination works from anything from Kohl's for Black Friday, so you can get gift cards at a 20% discount using Samsung Pay, and then get 30% Kohl's cash on any purchase during black friday as well.