Just don't expect to find any for Disney tickets. Those dried up around 2004 or so. They were awesome. Simple interaction with the ticket seller cast member got you a free one day pass into any park. You could do six a day. I did six. My husband did six.
One of the shops got contested. Cast Member described my husband as "Caucasian with brown hair." LOL Nice try. That's like describing Shaq as a 50 year old male. If the Cast Member had really known which person shopped him, he'd have given a better description. I described my husband to the scheduler, and I got paid immediately.