Verbatim, Imation, Ricoh & Mitsubishi DVD+R DL 2.4-4X depending on writer used.
Quite a lot of 8-12X media
And I got verbatim (TYG01) +R 4X and written as fast as 16X when I 'm using Asus 1604P. The TYG01 is US $ 5.5 for 10 pcs.
I'll check the media available right now in HK on Thurday and give you more details in the media later.