Khypermedia 100pk 700mb 80min cd-r spindle free after rebate at OfficeMax.
You can pick these up online at:
http://www.officemax.com/
Search for 20187245
They cost 20$ each with:
Khypermedia $12 Rebate
Office Max $8 Rebate
All you have to pay for (after rebates) is tax if you pick them up in store. Otherwise you will pay for shipping also.
I've gotten at least 200 of their cd'rs for free in the past and haven't had a problem yet.