I went to a Best Buy in San Diego too. It's a small one in Mira Mesa.
A Rio representative came there at the same time and was educating the Best Buy employees about the Nitrus and Cali, etc. He also talked to customers of MP3 players and tried to convince them to buy the Rio products (well of course). He said that the Karma would be in stores in a few days, but I am not sure. He said they shipped already.
His name was Scott. Does Scott visit these forums? Heh.
Peter D. Lai