Fire, I got my Razzle Dazzle thread at the local quilt shops here & in Albuquerque. Patti got hers online - I'll let her tell you where.
I am putting it in the bobbin and quilting from the back side. The technique is that you quilt from the front using invisible thread (or water-soluable thread), then put your bobbin with the RD in it and turn the piece over. The quilting you did is a guide for where you now stitch. It takes a few tries to get it right. I still can't seem to get the thread exactly on the line, but I'm getting closer with each try.