Shop Till I Drop-
You can also try
www.kennedyspacecenter.com
IMO it is well worth the short (1 hr. or so) trip from the Disney/Kissimmee area. Get there early and go on the "Nasa Up Close" tour. It was great!! We were there during the week of June 11-19 and were well pleased. I was disappointed because, at that time, the "Rocket Garden" was closed for refurbishing, but the Astronaut Memorial and Space Shuttle cut-away were impressive. The tour that I mentioned is by bus, lasting around 2 hours, and if you're really 'into' space exploration at all, you'll love it. That'll add another $20 to your day, though.
Have a wonderful trip!