Shop4tech.com has a new 15% off promotion that runs until 07/13/08.
Just enter coupon code "SS15"
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 a little more than $10 a pop. Best of all, shipping is free.