It seems like Sprint is running real low on their supply of HTC Evo 4G.
I can contest to that by the number of visitors I get on HTCEvoHacks.com versus PalmPre-Hacks.com and NexusOneHacks.net, the web traffic coming to my HTC Evo Hacks blog site is about 3-5 times more than the Palm Pre and Nexus One as seen in graphs below.
From those figures, I can roughly predict that Sprint has sold about 3 to 5 times more HTC Evo 4Gs and that number is