I suspect as others have pointed out, that it is a matter of supply, especially for the screens of the Kobo Glo. There is on youtube a comparison of the Nook simple touch with glow light and the Kobo Glo and after viewing this, I truly lust after the Glo which has so many features in regard to fonts. I already have a Paperwhite and really like it, but I also would like something for reading e-pub which is why my interest in the Glo. A lot of digital library books are only available in e-pub, anything new from Penguin being an example. But I warn you, if you watch this video, you will be wanting the Glo. I am willing to wait, but very impatiently:
http://www.youtube.com/watch?v=MT1kin1xQEM
And if Canadians are feeling smug that they have it and we don't, I think they are entitled since they are currently locked out of the Paperwhite and the Kindle Fire.