That is a beautiful ring, and very unusual. I have actually never seen anything like it.
I doubt that their really are any Tacori discount retailers, and to tell you the truth(I once looked at buying a Tacori setting) from everything I have read, quality is often times not what it should be.
I would consider having a skilled custom jeweler design your ring, it will be the same cost or less. I used Maytal Hannah for our ring a while back, and quite a few people on here who used her services have gorgeous rings.
There are so many good ones...to me that is when you will get the most cost savings, and the best quality.
Just my two cents.
I found your tacori ring 2518RD65 at www.toppersjewelers.com but unsure what they are like to deal with.