You are asking for high quality at low prices---not going to find that easily. The Ridata are generally considered good quality disks, so you probably won't find anything better in that price range unless you find a sale somewhere.
If you want the best disks, pay for them. If your recorder can use -R disks, go down to Walmart and get some Maxell 4x -R disks made in Japan, or some Fuji 4x -R disks in packs of ten, also made in Japan. Either will be very high quality (those particular Fuji's are Taiyo Yuden).
+R disks made in Japan are hard to come by in the US, but there are a few places to order them online. They typically run about $2 a disk, sold in packs of 50 or 100. Only seen Taiyo Yuden so far.