There are several. Look at the thread My latest creation... Here now by popular demand!" at bottom of page or overflowed on page 2 for a commercial product, for one example. Others should pipe in and provide more specific info on what they are using.
I have re-purposed several old PC power source enclosures for project boxes. They are a nice size for small projects, and would otherwise be thrown away.
One of them is sitting on my desk right now.
Neither my projects nor their enclosures are "commercial grade"
wow, I need to slow down. I totally missed the "propeller education kit" part of your question. My apologies. My previous links probably left you a bit confused. Anyhow, here is maybe a little better example. I think the PE Kit board would fit into a similar case.......
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http://forums.parallaxinc.com/forums/default.aspx?f=21&m=414611
http://forums.parallaxinc.com/forums/default.aspx?f=21&m=436011
(used the old forum site so the pictures are intact)
One of them is sitting on my desk right now.
Neither my projects nor their enclosures are "commercial grade"
--trodoss
Here is another thread with more details on how I setup this case using a step drill, nibbler, etc.
http://forums.parallax.com/showthread.php?t=123266&p=915581