The RRDi, a non profit organization, has affiliate relationships with Amazon and Demodex Solutions. When you click on an item in our shopping cart (which is disabled since we are not selling anything) the RRDi receives a small fee if you purchase the item. You will be redirected either to Amazon, Demodex Solutions or another affiliate web site to purchase the item. You can view different categories by clicking on the the different ones in the right column and browsing. You may also give up to a five star review for the item. Thanks for supporting us!