My experience with Sony media is very limited, just a couple of discs from a trade with a buddy. I wasn't too pleased with them because the reflective layer began corroding around the edges within a month of burning them and handling them. I don't know if that was just one batch or indicative of a general quality control problem with Sony.
By the way, do you have a link for those $2.94 specials? The only deal I see at my local Staples is $7.94 for 100 74-minute Maxell discs: