Go to Amazon.com and buy a gift card. Choose “Instant Delivery: Email” and send the gift card to your own email. When paying for the gift card, make sure you use your prepaid credit card number and the full remainder of the Visa gift card balance.
In just a couple of minutes after purchasing the gift card, you will get it in your email. Then you apply the gift card balance to your account, and use it on your next Amazon purchase.
Since it is difficult to use the exact balance just by shopping at stores, this is a good way to clean every last cent off that card. Also, a good way to “regift” that Visa gift card by turning it into an Amazon card that you can give to someone else.