^I wouldn't know. I'm not sure why you'd need to ask if you already know Amazon's price.
Or are you asking if it's worth
$15? I'd say that's a remarkably low price for a full-season set of any show. Unless you're totally broke or have more important expenses you need to save up for, I'd say it's easily worth it. Although you could also rent the set from Netflix if you have an account there.