Call in the Snowshack at Hotel Markony opposite the main ski depot. They have the full range of body protection gear made by "Red", a part of the Burton snowboard group. Much cheaper than the UK.
The girlfirend purchased hers on-line for around £30, they did make her bum look pretty big but she didn't get any nasty injuries - you'll probably only need them for the 1st year and be able to sell them on ebay easy enough once you get back - PS wrist guards are essential don't try to learn without them as it's unlikley you'll get through the week without something nasty happening!