for those not used the buying DVDs in japan, yes they are usually very expensive, and that is the norm usually. If you think we pay a premium for domestic Anime DVDs here ($29-$39 per 4 episode DVD), japan pays like $50 per DVD, and sometimes theres only like 2 episodes in each disc.
Coop Cup DVDs are like $45, and last year's SBO DVDs were $50-60, but had multiple games within, at least this year you won't be paying for a game youre not interested in watching but buying a-la-carte.