Give Shintaro a try.
I have used 40 plus with only two bad disks, one I should have detected when I bought the disk from a market trader.
JB Hi Fi sell 1 X at $2.99 a disk inc. case
I can get them from a local supplier at $3 a pop
2 x Shintaro's are $3.50 but I haven't tried them out yet.
They will be cheaper again if you buy them in a spindle pack. Try Sold.com.au or blankcd.com.au if you want to purchase online.
There's an article at
www.doom9.org written on 11/4 that says your burner is a rebadged Pioneer and it explains how you can convert it into an original Pioneer drive and enjoy the benefits that may reap. I haven't read any further but it may be worth your while.
Good luck !