L.
Hi!
The only one I know of is the Joovy BIG Caboose. It has 2 seats that can hold carriers(universal) as well as a sit/stand on the back. I have this stroller and the negative is that your little one will still be kind of little for the sit/stand seat--it is perfects for the 2 year old here that uses it. Also there is not that much room on the 3rd "seat" once you put a carseat in the second seat and recline it. It is a nice stroller and fits in the back of my minivan--would be perfect once the twins can sit in the seats and your older one is a little bigger. It would closer to your price range and is good quality!
L.