photography-on-the.net/forum usually have plenty "new" ones from all the Canon folks dumping it to grab a Tamron, Tokina, or Canon L lense from their kits. That's where I usually pick up "used" lenses nowadays since most of those folks tend to be very anal with their lenses...including me! LOL.
Why do you want the old kit lense when there are plenty of alternatives out there that are far better? Just a thought. What's your budget on the lense? The new IS version has gotten good reviews from a lot of folks. It's no "L", but for the price, its gives a good bang for the buck, especially with IS built in now.