I found a free game site that has a Bunco format,  with about 30 rooms unfortunately they are all empty.  I am not sure if this is a new site that no ones knows about but no rounds will start because there are no players :(

The a game called bayou bunko - the site is valusoftarcade.com - under Red Hot games on the home page or once your in you can enter valusoftarcade.com/games/gamepage.aspx?G...

It's worth a look.. at least until the on-line site here gets up and running.  The site is really cute but hard to get around. If you figure out more let me know, I would really like to play on-line again. MSN and prilosc sites are offline now too.