If you've got an extended battery on your HTC EVO 4G, then you know better than anyone that the selection of cases that are compatible with the handset's bulky backside is very limited. Since there isn't much to choose from, there aren't a whole lot of decisions to make. You don't have to pick a color, select a style, or shop around for the best prices because sometimes there's only one case out there that fits.
But if the 3500mAh Seidio Innocell is your EVO's extended battery of choice and you managed to hold off on buying the official Innocase Extended case for it, then your patience has paid off. It's still the only playthrough case available for the Innocell (so your wait for more choices continues), but Amazon is now selling it for 40% off the list price. You can still get the Innocase Extended directly from Seidio for $29.95, but why would you do that when Amazon has it for just $18?[Amazon]