Peter White in Acton, Massachusetts carries normal colored Continental Competition 25 (which I believe have been discontinued in favor of the 19 and 22 models) tires in his shop. I suppose that Conti doesn't really have the classic-type look or ride of a Vittoria or Veloflex, but there aren't a lot of options nowadays.
http://www.peterwhitecycles.com/
Tom (Vittoria Pave tires are nice, but the green doesn't match my blue, but fine riding, Gran Crit) Nyzio Pawtucket, RI