Protech Star Cases?
 

How many of you MOC collectors use these? Which kind works best for MU, and is it better to buy them bulk from Protech or a little at a time from eBay?

I don't use them for my MU but I use one for my Darth Reven and Signed Green Ranger figure.

If your collection is MOC then they're perfect. I use them and they fit all of the figures including the bigger ones (ie Hulk). I don't know about ordering them direct from Protech. I order them on ebay from ebay seller id ke_toys . He's really awesome!!!! I can't say if his prices are up or not though. For 50 shipped it costs $135 USD

is this one of those clear rectangular cubes that go over MOC toys?

Yup, that's what I'm talking about.

The two I have:
http://i250.photobucket.com/albums/g...II/IMG1876.jpg
http://i250.photobucket.com/albums/g...II/IMG1837.jpg