Radio Shack’s HTC EVO silicone sleeves available online
If you went to Radio Shack to use the $20 accessory credit that was included with all HTC EVO 4G preorders there, then you probably walked out with an invisibleSHIELD and/or a car charger. Most stores didn't receive the other accessories they were expecting for today's launch, so we still don't know if they'll be selling unique cases or just the official HTC/Sprint ones.
A little digging around on Radio Shack's website and a quick comparison to the accessories I bought from Sprint today reveal that at the very least, the "HTC Black Skin" listed in the store's inventory system could be these EVO silicone sleeves now available for $11.99 apiece. The "Black Skin" could also be the official silicone (actually called Gel Cover), of course, but the items shown above are definitely not Gel Covers, which have three separate cutouts for the EVO's flash, camera, and speaker.