I highly recommend the PetGear strollers. Daisy has the AT3 (blue) and the Sportster (lilac). I love them both.
You can check them out at
Just Pet Strollers - Free shipping on pet strollers from Pet Gear, Kittywalk, Happy Trails, Petzip, Burley and more
and
Pet Adventure Outlet, Pet Gear Pet Strollers, Play Pens, Stairs, Ramps, Travel, Beds
But when you are ready to buy, I found the best prices on eBay from seller "adventurepets." The eBay store is "pet adventure outlet" -- same as the above website, but cheaper. Let me know if you cannot find them on eBay.
My avatar shows Daisy in her Sportster!