I'm so glad I started reading this thread. You all are hilarious.
I just made my first trip to WDW last month. Sadly I did not know about the lime Mickey's.

I did however have my husband run to Home Depot right away to pick up as many paint chips that he could. Told him to make sure he wasn't caught (I did have to give him a little explanation as to why I needed them). He even called me on the way to make sure he'd get the right color.
He came home & handed me 3 Sonic Boom MPCs and told me that was all they had. Then he said just kidding & handed me 28 Alien Green Mickeys. Pretty sneaky of him because I didn't even mention the Sonic Boom's as a back up choice.
Sadly we won't be returning to WDW til atleast June 2007, but on the bright side I'll be well prepared.