For the last two years, for two weekends, in late November and early December, Target has had a coupon on their website which you can download/print (I think you can print a max of 2-4) where you get a $10 target card with a $50 purchase.
Since Disney gift cards are classified by Target as "entertainment" cards, this works. You purchase a $50 Disney GC, pass them your coupon, the cashier scans the coupon and a gift card (to add $10 to it) and you get charged $50.
You then use another coupon for $10 g/c with $50 purchase, buy another $50 Disney entertainment card, hand the coupon over, get another gift card (for $10), use the first $10 gift card as a partial payment, and then pay $40 for the $50 Disney entertainment card. People have reported that the cashiers tell them they can do it up to 4 times with that specific cashier.