Latest info as of 1-25-06
Here's the best info I've got to date.
CZ-83 NIB are as common as dirt in .380 nickel or gloss blue, but not in the matte black aka black polycoat. If looking for one in blue or nickel, any gun store can order one, or may even have one in stock.
However, if you want a NIB .380 in matte black, Makarov.com is the only place I know of. They don't have any yet, but they'll be here by March 2006 or April, I've heard.
CZ-83s NIB in .32 ACP are still fairly common on GunsAmerica.com and GunBroker.com, even though they're not imported anymore. The blues are common, sometimes blacks, I've never seen a nickel.
The tougher ones are the NIB 9x18s. They're still available in glossy blue at GunsAmerica.com and GunBroker.com, but aren't common. However, in nickel and matte black they are very rare, in my experience.
However, Makarov.com is going to be getting 9x18s in all 3 finishes sometime in March or April 2006. So I've heard.
For more info from Makarov.com or to preorder see the following post from Makarov.com:
http://www.gunboards.com/forums/topic.asp?TOPIC_ID=144719