Welcome to the forums Gwen.
Your question is different from the original one in this thread, and we can move your post into your own thread if you like. Let us know.
The three sites I normally recommend for our American members are more like retail outlets, rather than wholesale, so I'm not sure they can provide you the discount you want. Those sites are trustworthy, and are Rima.com, Supermediastore.com and Meritline.com.
We generally recommend Verbatim brand +RW discs, but they tend to be more expensive.