I bought fairly cheap one from Walmart. Don't remember the brand, but it did come in a box.
Just an FYI - if you buy a lightweight stroller from Walmart, be sure to ask about the back wheels. My parents bought it for me and put it together while I was at work for a trip we were all going on. My dad took the first one back because it didn't have the back wheels. Before he exchanged, he opened the box to make sure the wheels were in the second - they weren't!
Apparently Walmart takes the back wheels off/out of the box and keeps them in the back to prevent stealing. Of course, what cashier will think about this when he/she is ringing it up?