Early reports indicate that BestBuy will carry (almost) a full line of hardware, including 17" LCD, 12" PowerBook, 15" PowerBook, 17" iMac, 15" iMac, eMac, 12" iBook, PowerMac G4 1.25. Notably absent are the high end configurations of the 17" PowerBook and G5 PowerMacs.
Obviously, stock/inventories may change by launch day.