We just ordered a total of 4 (2 for each kiddo) of the bracelets that slip over the wrist, like the "Live Strong" bracelets from a few years ago. The ones I got are 2 colors, so the writing stands out, and they even had a Disney font that looks like WDW writing! I got 4 bracelets that each read "If I'm lost, #'s on back" on the outside, then the reverse side (hidden against their skin) has their dad's and my cell phone numbers-including area codes. My kids will be 6 and nearly 9 when we go, but in a scary/stressful situation, I'd rather know they've got a helping hand.
The site I ordered for is sending 4 bracelets, purchased using paypal, shipping and tax total for like 26 bucks. I ordered from 24hourwristbands.com