Amazon is currently offering 2 different discounts on LEGO Dimensions packs depending on what you buy. All Fun Packs are $5 off while all Team & Level Packs are $10 off. Since this applies to pre-orders too, it’s great to get a discount on upcoming packs.
The discounts will show up at checkout and you can purchase as many as you want in an order. Make sure the seller is Amazon and not a third party seller.