I have a cute one from Zazzle.com that reads, "I have Asperger's, what's your super power?" It's pretty common actually, I've also seen ones that substitute "autism" for "Asperger's". I've seen others on various parts of the internet (cafepress.com is a good source) that say things like, "I'm flappy when I'm happy" and "Autistics rock. And spin, and flap, and...".
I also like to go to websites that allow you to design your own garments (again, cafepress does this) and just create my own sayings. You can get everything from t-shirts to hoodies to blankets to mugs, and a whole lot else besides.
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"Survival is insufficient" - Seven of Nine
Diagnosed with ASD level 1 on the 10th of April, 2014
Rediagnosed with ASD level 2 on the 4th of May, 2019
Thanks to Olympiadis for my fantastic avatar!