Reddit reviews Sword Art Online Progressive, Vol. 4 - manga (Sword Art Online Progressive Manga)
We found 2 Reddit comments about Sword Art Online Progressive, Vol. 4 - manga (Sword Art Online Progressive Manga). Here are the top ones, ranked by their Reddit score.
WARNER INTERNATIONAL
http://www.amazon.com/dp/0316259373
http://www.amazon.com/dp/0316383775
http://www.amazon.com/dp/0316348759
http://www.amazon.com/dp/031631465X
Here you go. There's the whole "(manga)" part in the name, so they are pretty obvious, though.
Did some hunting:
According to this Amazon page, we can expect Volume 4 in English in late March this year (so around the release of Batman vs Superman, get hype for more SAO).
Though the wiki states that the volume was released in Japanese last December, so I suppose there's still the issue of it taking them 4 months to translate half a dozen A4 pages of text.
But no matter, only 2 more months :)