Update: GiftCardMall recently updated their website and the maximum denomination for Visa gift cards is now $250. This update alters the math significantly. For more on the changes, see this Miles to Memories post.
Many of the online portals used to pay out for purchases of Visa gift cards through Gift Card Mall, but that opportunity dried up last year.
Fortunately one portal is bringing it back! Through 7/20/15, Simply Best Coupons is offering .4% cashback on the purchase of these cards. The price of each card including shipping varies depending on the quantity purchased and shipping type, but ranges between $7-$8 before cashback.
According to the company:
This is a short term opportunity that will end on or around 7/20/15 and subject to change without notice. We will email everyone who makes Visa Gift Card purchases warning when it’s about to end.