So here's an interesting little fact: if you go to Sprint's site right now and look for the EVO 3D, you won't find it. Really. Go look for yourself, we'll wait.
Back? Told you it was gone. The bigger question here, though, is why. And for that, we don't quite have a good answer. Perhaps Sprint said "you know what, we don't like this thing anymore. Plus, the EVO 4G LTE is coming soon. Let's get rid of it." Or maybe not. Maybe it's just some weird thing and they took it off the site to see if anyone would notice.