Before I hand out advise to someone, I wanted to make sure it was accurate. Can you use a Red Card at Target to get 5% off Disney gift cards and then use those gift cards to buy tickets through UT using the MS link? We're trying to figure out the absolute cheapest way to get about 8 tickets.
No, you can't use Disney gift cards at Undercover Tourist, because they are not Disney. Disney gift cards can only be used at the parks, resorts, restaurants (most), Disney store, Disneyshopping.com.