I group the two seasons together in my assessment.
@Cherry: A BD DL costs $12 in America if you only buy 1. If you buy 10 they're < $9. If you buy them in bulk (like any publishing company), they're priced so that the price of a blank blu ray isn't all that much more than a DVD (and that any markup of blu ray is just because they want to).
Just to try to find some comparison, I looked up the price of the Ga-Rei Zero DVDs. I couldn't find a box set, but to make up for that, these DVDs are 2 years old, so bear with me here. On DVD the 12 episodes are sold on a total of 6 volumes (cause Anime is dumb like that) for a total of 25,313 yen when I checked (on Amazon.co.jp), meaning that to buy the DVDs from 2 years ago, it's actually more expensive.