I use mine a lot! They are great if you are taking more than one pupster to the vet. I also use mine for shopping trips...they go the mall and Hobby Lobby...any place that allows them!
I have bought all of mine on Ebay. I have two right now. They are super reasonable .. $50 and that includes shipping. The quality is not the same as the ones you see in some stores, but honestly, I have used these strollers for about three years now. My oldest one is in good shape...it is just a bit faded so I bought a new one. I also bought another back up and have it stored away for the future. I have checked out many strollers for different things...the space inside was important to me as I often take 3 or 4 out at a time. I also do not like the ones that have a dip in the side...it is too much of a temptation when the thing is unzipped for a pup to jump out. The one I use is pretty deep. My kids are very comfortable in theirs. They actually go to sleep in it!
It has storage underneath and a cup holder.
Here is a link to the Ebay one I have:
New Pink 09 Model Pet Dog Cat Stroller w/Rain Cover 3P - eBay (item 280267976521 end time Oct-11-09 16:39:05 PDT)
Here are a couple of links with my pups in it:
http://www.yorkiehavenrescue.com/dogshow09/tired_pups http://www.yorkiehavenrescue.com/dogshow09/pippi_armani