The UppaBaby Vista is gaining in popularity. In August 2009, the number of searches on Google for UppaBaby Vista was 70% of the number of searches for the Bugaboo Cameleon. Compare that to May 2008, for example, where this value was only 20% and you will see a trend there.
For the best prices on the UppaBaby Vista I recommend you go to StrollersPlace.com. They keep track of the prices everywhere manually so you are bound to get the best deal online. Here’s the link: