Always sign up for the free rewards program. You earn roughly 5% back in points, but the real value is in Double Points events (10% back) and exclusive "Gift with Purchase" (GWP) items that can be resold to subsidize your costs.
Use their "Buy" tab to see a real-time list of the best discounts across major global retailers. how to buy legos cheap
Set price alerts for Amazon to get a notification the second a set hits its "all-time low" price. Always sign up for the free rewards program