I recently purchased some natural sidewall Deda RS Corsa tires, 700x23 (actually they measure closer to 22mm) online from World Class Cycles.
I got the impression they are a small operation, but very nice folks. Speedy delivery, great price, good communication. I'd buy from them anytime.
For what it's worth, their "olympico" tubulars are fantastic too.
Grant McLean Toronto, Canada
Subject: [CR]gum walled high performance clinchers
Does anyone manufacture the vintage style gum walled high performance clinchers anymore? I can find black and every color of the rainbow, but not the old syle gum.