I bought $850 worth of gift cards(17X$50) last night at Target. Only after nearly booking our flights did I come to find out that SW will only accept 4 payments per reservation, ie 3 gift cards and a credit card. So what I had to do is make a reservation separately for each person each way. It was a real PITA. You would think that Target and Southwest would sell some higher denominations to prevent this from happening. Hope no one else runs into trouble!