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check out zoogue.com they have the free case thing going on still and it's pretty much like the NGP
 
Loads of similar on ebay - search for clear TPU case.

http://blog.arogan.com/2010/07/clear-tpu-iphone-4-case-from-ebay.html

Or, if you're after brands:
http://www.iskin.com/iphone4/claro/
http://www.belkin.com/IWCatProductPage.process?Product_Id=512159

I'm also after a clear case, like that one in the blog. For putting over a Gelaskin. Do the clear cases turn yellow over time?
Those are all good but those are all hard plastic. The Incipio case above has a fair amount of flex to it.
 
They're not hard plastic. More like a resin with flex to it.

What exactly is 'Next Generation Polymer'? Is it Incipio's fancy term for TPU?
 
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