I buy it online because it's easier for me. I prefer to get the one that has the highest mg per caplette, and I can shop for it much more quickly online. I buy mine from betterlife.com http://www.betterlife.com/prod_list.asp? .
Copper chlorophyllin is another supplement that is used as a deodorizer recommended by the National Institute of Health in website http://rarediseases.info.nih.gov/GARD/QnA.aspx?PageID=4&CaseID=20839&.... Chlorophyll is the green part of plants and vegetables, which are good for you. They recommend a dosage of 60mg three times a day after meals for three weeks in this website.
People here in the forum have explained to me the importance of taking zinc with copper chlorophyllin because it somehow counteracts the copper that comes with chlorophyllin, since a buildup of too much copper is not good for you. So, I found that the same website that sell the activated charcoal also sells 100 Caps per bottle of Chlorophyllin with Zinc 100mg for $16.49/U.S. (see http://www.betterlife.com/prod_home_page.asp?prod_id=28213) . Some other places sell the chlorophyllin cheaper but it doesn't contain zinc.
If you order your supplements online, I recommend that you get them all from the same website to save on shipping costs.