If you think you've seen those snap-on cases over there before or the "Xmatrix" name rings a bell, then I'm impressed with your memory of G&E posts. We chatted about these perforated plastic cases a few months ago when DayDeal was selling them in a handful of colors for $15.99 each.
You're looking at them again today because HTCPedia Shop has a different selection of colors in stock and will let you have whichever one you want for only $8.99. The case has been rechristened the Xmatrix Rear Protex Injection Case—quite a mouthful compared to XMatrix Back Cover—but other than that, nothing about it has changed in terms of build quality.
If you're interested, dark blue, black, red, clear, white, purple, and hot pink are on offer at the link below.[HTCPedia Shop]