I don't remember them ever having Walgreens. I do remember CVS but the trade is $45 for $50 so it isn't really worth much.
If you did want to apply the money to your Disney trip I would recommend using your discovercard to pay for the trip since they have a 5% travel/hotel reward (that's now thru March) for up to $800 in purchases (you can sign up online or over the phone) - $40 cashback. Apply your current rewards to the balance and then also apply the $40 in bonus awards to the balance.