Kevin,
Welcome to Anandtech. Hopefully this place will help you find some good deals, and maybe you'll even find a deal or two to contribute.
TextI've got a Costco membership where I live, and pay $45 a year. It's a little steep, but the things I buy pay for it in the long run. Got a spindle of TDKs, 50 CDs plus cases for $20. Anywhere else the cases alone would be $20 for 25 and I got 50.
Plain old Wal-mart has had the same prices, without a membership.
The most I've payed for 50 cases is $10, and that's the slim cases. And, as far as CD-R's go... if you do some searches on here for CD-R deals, you'll find that your $45 membership is saving you less money than you would save by watching the forums. Good luck on finding the deals!