Join Date: May 2013
Location: ABQ, NM
Bikes: Novara Verita, Novara Buzz
I found a decent, used Trek Transit Deluxe on CL for $75. I saw a bunch of used ones for the couple weeks I was looking and if you are willing to go higher, you could probably find a used Burley or Chariot. The kids love the trailer and its nice to have some extra carrying capacity for groceries or other errands.
IMO, you can't beat the trailer (I see that is the route you chose). The kids can carry their snacks, drinks, toys, etc and keep themselves comfortable and entertained. I'm guessing that isn't true for bike seats.