Not really true...
I went to the Duluth, GA Best Buy store on release day, just to check it out (I'm waiting for a 3G).
The sales girl (OMG cute!) said that they sold a bunch of 16GB units that morning because that's all they got in initially, but then around 11am they received a PALLET full of units...
It seems like initial shipments were decent, it's the replenishment that's been the problem - they are only getting a couple at a time.
Weren't there reports back in Feb/March about production problems with the screens? Maybe Apple just wasn't able to get as many built before release as they had hoped to? Plus, I'm sure the demand is higher than they were expecting... Especially for the Wifi only models.
Anyhow, things are going to be even more crazy when the 3G models come out. While I have access to several Apple stores here, I'll be buying at BBuy so I can put it on m BBuy card and get the reward zone points. You can bet I'll be at the Duluth store EARLY that morning!