1) Make sure to add your store cards like costco to get better prices
2) If it still works, if you link delta skymiles you get miles whenever you order and 3 free months (can be activated after you use up your 3 free deliveries)
3) (then) Add a Chase card to get another 3-12 months and statement credits back. Each card can stack. I think you can add cards until July and get the bonus months (which will last for however many months you get)
4) having a costco membership number will get another 2 months
fantastic way to buy gift cards for less. The invite code is only $5 off your first order, so I would recommend not using it and instead using code 15PERCENT which is 15% off your first order, up to $20 off