I had to purchase the Kolcraft Stroller at WDW in March. It was $58 including tax. I didn't bring a stroller because our cheapo had been stolen last summer, and we made it fine the remainder of the trip without a stroller. Unfortunately, DD ended up getting sick on the way down to WDW. She stayed at the hotel with DH for a couple days until she was better, but after one day in the parks without a stroller, I could tell her body was tired from having recently been sick. We also brought the stroller on our cruise. It turned out to be a nice little stroller, and we brought it with us when we returned in May. It even had a cup holder, and the back had clips that could be moved to recline slightly. At the end of our May trip with the stroller, we didn't have enough room in the car to bring it home, so we just left it. We definitely got our money's worth considering the cost of renting a stroller.
I have to admit, I didn't search for a cheaper one. I just knew we could not go on without a stroller for her and went to the nearest shop (which happened to be Mouse Gears @ Epcot) to purchase the stroller. One thing to remember is that the stroller is sold in the parks, so a lot of people have it. We tied a bag to the handle so we could identify it more easily.