I always buy this one...have it in different colors. I have used the same stroller from Best Pet for many years and have been very happy. They are roomy and sturdy and very inexpensive!
Large 4 Wheels Pet Dog Cat Stroller 18 Color Choices with Free Rain Cover 400 | eBay
Just be careful when you select a color....sometimes the item changes to a three wheel stroller. I much prefer the four wheels! There are other sellers on Ebay with this same stroller. To search for them use these terms: pet stroller rain