Please be careful when purchasing the Disney cards at Target, both online and in-store.
I bought 8, in-store, over a period of a couple months. When we got to Disney and wanted to apply them to our room charges at check-out, one was invalid. I did not have the receipt and Target would not help at all, even though I'd paid with my Target card and they should have been able to look it up.
I lost $50, which is far greater than the amount I'd saved.
Check other threads that mention the same issues, especially with online purchases.