I bought blank DVD-R made by TDK for 105 yen ($1.05 €0.80) at a 100 yen shop. It includes 2 disks.
In Japan, they say DVD made by Taiyo-yuden is most reliable. Actually I am using Taiyo-yuden's DVD for my important data which has to be kept for decades.
If you want to know something, ask me please.
