http://www.safelinekids.com/skprodsns.asp
This page has a list of retailers -- I think we ordered ours online -- maybe from One Step Ahead?
This was a lifesaver -- you don't even have to take the child out to collapse it into a car seat. The only issue we had was the handle got a little loose on the trip out to India (we checked it). If you manage to keep it in the original box, that probably won't happen.