I think dj898 made a case (or, rather, re-purposed an existing case) for HuCards. I think he posted a pic here.
I've never looked, but I'm sure you can find something that will work. For example, try searching for a small case that holds business cards...
Once you find a case that is the right size, you can modify baseball card products to suit your purposes. You can cut an 8 1/2" x 11" page into a strip or two. Each strip will hold 4 HuCards. Then you can fold the strips (accordian style) and stuff them into the case. No, this won't be the sexiest looking case...
I'm sure other folks can offer even better ideas