The current customs rules, combined with the firearms center rules, made importation of a dewat virtually impossible. However, there has been a recent successful importation of a good number of dewats by this company:
http://www.kopfjager-militaria.com/store.htm. It took them some 16 months from start to finish, and the guns are welded up pretty solid.
If you go to that link, click on the "deactivated weapons" page. Unfortunately for most of us, it is primarily communist bloc guns. I saw many of these at the Calgary gun show this year, and was impressed by the quality and variety of what they had, although I see a lot of it has since sold out. The SA6 has me almost ready to make a road trip to Edmonton. I did pick up one of their ZB37s at the show, and it really showed the Bren gun's lineage.
The link Marc has shown for the airsofts is also a good one. Very reasonably priced, although personally, I would rather spend the money on a dewat, which appreciated in value and has some history.