People have reported success buying from
www.meritline.com, although I have no personal experience. I did buy some discs from
www.american-digital.com once (I wanted to try Mitsui which aren't available in my local retail stores). I had no problems with my one transaction with them. And don't forget that Best Buy, Circuit City and CompUSA all ship mail order as well, often with free shipping. If you can catch some on sale, you can do quite well. Even without the sale they appear to at least be competitive:
(prices for 100 48x TY)
Meritline generic TY = $50.62 including shipping
Americal generic TY = $47.74 including shipping
American Digital generic TY (32x) = $41.28 including shipping
Best Buy Fuji TY = $39.99 including free shipping
CDR Planet generic TY = $33.93 including shipping
Interestingly, Mertiline and Americal seem to be the same outfit. I've noticed such things in the past. Many different online CD-R retailers seem to end up on the same checkout page...
cfitz