So we have an Uppababy Vista which has proven to be a great asset on the uneven pavement of Brooklyn sidewalks! Overall, I really love it. However, we now have a car and I find it kind of a pain to fold down and put in the (tiny) trunk of our Prius. I would like to use the Vista for jaunts around the neighborhood, but for times when we're able to get out and about on the weekends, I would prefer to have something lightweight, collapsible and relatively inexpensive.

Any recommendations? LO is 3.5 months, weighs about 13 pounds and is not so upright at this point in time.