For today and tomorrow, Amazon Prime members can get a free $10 credit when they buy a $40 Amazon Gift Card. Click this link to see the deal. You can even buy the $40 Amazon Gift card for yourself, so this is essentially a “free” $10.
Offer has a limit of one Amazon promotional credit per Prime account. The $10 promotional credit will be applied to the member’s account within two days after the qualifying Amazon Gift Card purchase is completed or, in the case of physical gift cards, shipped.
Does this include adding funds to your current balance at Amazon.
It should, but to be safe, you can always just buy yourself a $40 gift card for email delivery and then redeem it immediately.