Try supermediastore.com they have a good price on 4X Riteks. A spindle of 100 is on sale for $89. The sale page is at
http://store.yahoo.com/supermediasto...diacoupon.html I just picked some up and I have ordered from them before with no hassles.
Another place to look at before purchasing any media is
http://www.dvdrhelp.com/dvdmedia They have reviews on every disk imaginable so you can check compatibility with your burner and player before you buy disks that won't work.