There are a few stores around that do sell Kobos, but it's only independent book stores, not any big chain stores. And most of those independents won't stock every Kobo, but they say they could order them. I've only bought Glos and did pick them up from a local bookstore.
Here's
a link that lists some book stores that will stock Kobos. Kobo also has a list somewhere but I can never find it on their website when I need it. There's another small chain not listed that sells Kobos, Family Christian Bookstores. But call ahead if they do indeed stock what you're looking for.
Edit: Found a Kobo link, but it seems to reference back to the IndieBound.org site:
http://www.kobo.com/indie