When researching enzymes I came across this article which helped me http://www.digestive-enzymes.com/comparisons.htm. It has a link inside it ("chart #1") which gives a constituent breakdown and cost. Of course the people doing the comparison have their brand come out on top but I have been getting them for a year now with good and prompt service. At $45 for 270 capsules the deal is good based on whether you believe all the numbers in the chart. Of course, none of this marke is regulated so anyone of the brands could be fudging their labels.
My son used them 2 per meal so its about a 3 month supply (still seems like a good deal for the most potent brand out there).