When I was younger, I remember every Disney fan photographer used to have the same camera strap. It was black and white and had 'snapshots' of the characters all along. I wonder if they still sell those.
I think you'll find them in a lot of places. One store that comes to mind is a camera supply store in the Studios. The name and location will be on you map you get when you enter the park.
I bought one a couple of years ago in the Magic Kingdom in either Mickey's Star Traders or Merchant of Venus. It was $16 then. I've never used it. I found it to be too wide, and it cut in to my neck. I guess I didn't give it enough "break-in" time. It is cute, though.
I have the red one. I believe that it was around $20 last year. They had them at World of Disney at DTD. If you can make it to an outlet, they sometimes have other camera accessories such as bags. The one here in Ft. Myers has them often.
I had the red one w/ Mickey faces too...beware, we bought two of them at $18 a piece on Main Street and only wore them for a few hours, they were way too stiff and cut the crud out of our necks. I had bought one there about 5 years ago that ended up breaking that didn't have this problem at all so I was bummed.