I thought the exact same thing the last time we were there. There is no variety in the postcards that they sell. I think it's probably best to buy post cards before you get into WDW if you're staying onsite. If you're off site, there is probably more variety at a Wal-Mart!

( I gotta stop doing things at 2 AM!)
Sooo sorry about the mix up! 
My daughter would love to get a postcard from Disney!!! We are leaving December 20, so i would be able to send a postcard to anyone who wants one during the week of christmas. Please let me know.