as NotUrsula says - I am in the UK, where parasols are extremely commonplace, which is a bit unusual considering how little sun we get.... Rain covers are also common place, but that's more usual considering how much rain we get....
I couldn't see a price on that website you listed, but my parasol is just like the one NotUrsula linked to, and it was pretty cheap. It's not something i would spend a fortune on.
We can also buy a larger rectangular style one, which fits over a lie flat pram/pushchair which is great for a younger baby. These provide more shade, but are less convenient when you are folding the stroller. For my dd at 3 and 4 we just used a parasol, but we are bringing a baby in December, and will have the bigger sun canopy (of course, in December, the rain cover may be more important!)
I have also seen a third style, which is like a pop-up cube, you know those things that you twist to flatten, and then twist again and they pop up. I've never seen one in real life, but have seen them in a number of catalogs, they may provide a more all over protection if you are going in a very hot time, or with a very small baby.
there's a pic here
http://www.grobag.com/products/elements/rainsun.html
But that's an english website. I do think I have seen them on US websites though, just can't find one right now.
Bev
Bev