Paris Museum Pass

Please refer to the below points of sales of Paris Museum Pass.
http://www.parismuseumpass.com/en/pass_points.php
There is no sale point in HK. If you buy online, you need to pay DHL fee.
The most convenience way is to buy in Paris.
You can buy the pass at the Tourist Information Centre at Gare du Nord station (i.e. Paris Nord Eurostar Station).
http://www.parismuseumpass.com/en/pass_points.php?categoriepointvente_id=1&typepointvente_id=31

Alternatively, you can buy the pass at the first museum you visit.
http://www.parismuseumpass.com/en/pass_points.php?categoriepointvente_id=1&typepointvente_id=2