Shop4tech.com has a new 17% off promotion that runs today (August 22nd, 2008) only.
Just enter coupon code "WH17"
With the discount, you can get a 100 pack of Taiyo Yuden 16x DVD+R or DVD-R discs for less than $40. If Blu-ray is more your thing, you can get Verbatim 2x BD-R media for less than $10 a pop. As usual, shipping is free.