Buying a stroller is quite possibly more complicated than buying a car or even, perhaps, achieveing nuclear fusion. It is definitely not something that can be done online or in a short amount of time.
I visited Bébé Cash with a friend of mine and her one month old baby. We were able to test a broad assortment of strollers (Peg Pérego, Maclaren, Graco, Red Castle, Quinny - NO Bugaboo however) and the staff was very helpful demonstrating the various features.
They also carry a pretty good range of carseats, stroller & carseat accessories, Petit Bateau baby clothes, baby carriers (Baby Björn, Mobi Wrap, etc.), bottles, pacifiers, baby bathtubs, etc., etc. - pretty much anything you'd need for you or your baby.
The space seemed small at first, but there's an upstairs and a side room (where the strollers & carseats dwell). The selection overall is well edited so that there are items at both high and lower price points. (note that I did not say low price points, b/c that does not exist here).
The staff generally was helpful and patient with our limited French although they did seem a bit harried and communicaton between them was a bit lacking (we got to the register and the woman didn't know that we were purchasing the stroller or how much it cost).
Overall, I'd probably come back here for baby gifts and possibly buying some essentials if/when I'm expecting my own little one.
Note: They have a restroom that can be used if you need to nurse (or pee!) Strollers seems to be able to move through the store fairly easily. read more