One 50 GB BD-R is 25 bucks. Because the total size compressed is ~55 GB, the price would be around 100 bucks. And because the fact that the adoption rate for actual Blu-Ray drives in personal computers is so small, they would hardly sell any. A single DL-DVD-R is around 3 bucks. Both prices are for Verbatim disks which are extremely high quality disks.Now, buying in bulk will bring the price down but you still got the whole thing of Blu-Ray disks are expensive to make so its simpler to keep it on DVD\'s.