Choose mobile phones, then choose upgrade your phone. It's right under the 1-888 number.
So, I've got a theory...
Why are we hearing the delay is hardware related from some sources and i*hone related from others? The truth is the truth. There is only one. Why is Best Buy corporate insisting on the 14th as late as this morning? MAYBE there is some misdirection going on here by VZW... Perhaps the phone IS available on the 14th, but it drops with no fanfare. This would not be without precedent (see Droid Pro and Droid 2 Global... they just showed up one day) This keeps huge "Thunderbolt 4G" posters from posssibly swaying i*hone customers. This also appeases the Android masses.
After the i*hone hype dies down, they go on an all-out Thunderbolt advertising blitz.
I just got off the phone with the 3 closest Best Buy's in my area. All said they WILL NOT have it on the 14th as Verizon has OFFICIALLY told them the release and ship date is pushed back.