This site has the lowest DVD+RW media I could find. Frankly, I don't think it's that bad.
Their Sony media is $12.50, their own media is $7, and they've got another one for $5. Well, I'm not sure I'd trust the other brands, so I'd probably go for the Sony, despite its almost double price tag.
At the beginning, Tower Records sold blank Minidiscs for $17. Now we're talking about a format that plays on a wide base of existing players. I don't think this will have nearly the problem that MD had. Of course I could just be missinformed