Don't know what the go is here as this wasn't doable in the past.
The BizRewards 10% off (first BizRewards purchase) code is working on gift cards. If you just want gift cards, you'll need to add $60 worth to your cart to get free delivery. $6.90 otherwise.
Gift card T&C
The Warehouse gift cards can only be redeemed at The Warehouse. The Warehouse gift cards cannot be redeemed for cash, returned for a refund, exchanged or used to purchase other products. Unused balances are not refundable or transferable. The Warehouse is not responsible for any lost or stolen gift cards. Risk of loss or theft and title for gift card passes to the purchaser on transfer. This card and the purchases made with it are subject to the terms of trade as set by The Warehouse, which may change from time to time. Card value expires 24 months after purchase or last recharge. The maximum charge/recharge value is $1000.