Originally Posted by SecondSkin
Its interesting to note that its still easier to find 27" tires and tubes in the US -- they're in every Walmart/KMart/ACO Hardware. Walmart even stocks a $9 27" tire with reflective sidewalls. You won't find 700c stuff anywhere but an LBS.
Funny though that Bell (the tube brand you'll find in WM most of the time - rebadged Chen Shing), offers a 700C tube w/Presta valve - all their boxes show it on one side, and the color-code of these boxes are teal, yet, I've yet to see one WM that carries them.
-Kurt