I know most people use Phytopharmica brand DIM. I've always used Enzymatic Therapy DIM cos it's cheaper and it's actually the exact same product as the Phytopharmica one, but it's just sold under the different label. It is available here for $27 for 60 tablets, 120mg per tablet.
http://www.bodybuilding.com/store/et/pure.html However, there's a new product out which costs about half as much.
Olympian Labs DIM is 60 caps, 100mg per cap, for $12.99
This makes it by far the cheapest DIM I've come across, and bb.com has the best service ever.
I was wondering if anyone has tried Olympian brand? I'm pretty keen to try it as it actually makes it a lot more affordable for me to use. I was actually going to just use a-dex for financial reasons rather than to continue with DIM, but olympian changes that (assuming it's good quality).
Oh and on a last note, although it's expensive, it's interesting that the bodybuilding industry is getting onto the natural anti-e scene with this product which is a mix of Calcium D-Glucarate and DIM
http://www.bodybuilding.com/store/san/estrodex.html
Too expensive though.
If anyone has any cheap DIM links please post.
Thanks