Thom Hogan has noted on his web site that Nikon SB-800 flash is now officially discontinued and Nikon USA has canceled all dealer back orders. Few weeks ago Best Buy was cleaning up its inventory and was selling the SB-800 dirt cheap - in some locations for $200.
Quick online check shows that Amazon still has it in stock for $319.95, Adorama for $314.95 and B&H for $314.95. If you were planning to get this piece of Nikon history, now would be a good time to do so. The replacement model SB-900 is currently selling for $415.