Where can I buy I G Durand cristal.

There seems to be a lot of it about.
Now this really depends on a couple of factors;
Your location, if you require collection, or if you are willing to pay for shipping.

A quick Google turns up a lot of suppliers: Durand cristal - Google Search (http://www.google.co.uk/search?client=firefox-a&rls=org.mozilla%3Aen-GB%3Aofficial&channel=s&hl=en&q=Durand+cristal&meta=&btnG=Google+Search)