So I just got back from my store, did a bit of snooping around with the SKUs that I photographed.
The two Incase items for $39.99 are both Neoprene sleeves, most likely alternating cover. The Incase item for $49.99 is a 'Book Jacket.'
The Targus items had odd names, but are most likely once again sleeves.
20 of the Apple Cases were on order, I checked the dock as well but forgot how many it said were on order.
Out of curiosity, I also checked to see how many iPads my store would be getting (smaller store, but has quite a large yearly budget). On order were 40 of each GB type of iPad, and delivery date was April the 3rd (they'll come in on the 2nd on the truck, and will be unloaded that night), so I'm assuming the 15 was a very conservative number.
Also, I don't know how many people actually know that Best Buy is carrying the iPad on launch day; obviously the people around here do, but it is not advertised at all on Bestbuy.com, not easy to find on Apple.com, and obviously not in the weekly ad this week for Best Buy. So maybe there will not be much of a line at all..?
very great info, thanks for the update!!