Indolplex DIM is available from either PhytoPharmica or the parent company Enzymatic Therapy. A number of people have posted where to buy the PhytoPharmica brand. The Enzymatic Therapy brand is available here:
Enzymatic Therapy, Pure Rip with DIM, 60 Tablets - iHerb.com
I am currently taking the Enzymatic Therapy brand and will get my E2 level tested next month. I get an additional 10% to 14% discount on the Enzymatic Therapy DIM, as I buy most of our supplements there.