In general, .5mgs is an average dose, but it depends on the cycle size and amounts. Let's say you run 800mgs of test per week, then you'll need 1mg of arimidex ED.
I know they had it before, I've used their receptor grade IGF, but it doesn't look like they have it now. Maybe out of stock? you should contact them and ask http://www.ag-guys.com/store/content/contact_us.php