If you're looking for *cheap* and you mainly are thinking of groceries, check out Ebay and include the Burley children's models in your searching. People will let these go cheap sometimes when the older canvas gets a little skuzzy looking. The kids carriers can do groceries front and back (strap them in in the front). Pulling a kids trailer will get you more respect from cars, the drivers of which seem to feel that whereas jeopardizing your adult life is OK, jeoparding your child's life (or your grocercies) is different.