There's a thread over in the Reader Accessories sub-forum about making your own hard-case from a DVD security case. I've made two of them; it works splendidly. The DVD security cases are available from Brodart.com for way under $10.
Turning the security case into a reader case takes only about 10 minutes. And you wind up with a quite sturdy and light-weight hard-case that will protect your reader inside a suitcase, briefcase, or backpack.