I had great luck while yard-sailing this weekend; I scored this great display case with lighting for $10!!! The only defect is that the glass on the door is missing, but you can hardly tell as it simply looks like the glass is really, really clean. Ever since we moved to Portland, I've had most of my toy collection still boxed up, so it's great to be able to display them again. I still have the two shelves in the hallway with plenty of eye candy, and some of my collection is still boxed up, but I'm getting there!
Feel free to email me pictures of how you display your own collection at firstname.lastname@example.org and I'll be happy to include them in another post!