I was able to use mine in the gift shop. This was a year ago, but I think they are the same cards.
They have some pretty good sales if you look around. I bought a really nice hoodie for $10.
An alternative to that, get a MyPoints gc for any store you normally shop (Walgreens,
Walmart, Sears, etc). Then just take the cash you would have spent there and put it in your Disney fund.