It's called asnap and go from Gogo Babyz. Echildren usually carries it, but is sold out (which I found out when I went to buy one this morning, but they say they will order them for you if they havenone on hand)
So I wound up buying a Kolcraft Universal 2. It's like an umbrella stroller that holds thecarseat. It only weighs 12 pounds (less than the carseat) and was only $99 and fits all carseats. I think it'll handle travel a little better as well.