Promotion details:

Subtotal of purchases must be over $500 without the use of promotional gift cards, after discounts, before taxes and shipping cost. Promotional gift cards may not be combined to obtain additional gift cards. Rewarded gift cards can not be used in the same transaction. Promotion also excludes retailers, distributors, gift card purchases, kitchen equipment and clearance items.

Example: 

Transaction 1: If the order subtotal is $500, the customer shall receive one $100 gift card.

Transaction 2: If the order subtotal is $1,000 and the customer wishes to apply the gift card received from transaction 1, then transaction #2 will ONLY be eligible for one free $100 gift card because the promotional subtotal is considered $900.