I have my OCF link to Amazon bookmarked as Amazon/OCF and I always use that when using Amazon for purchases. I also check every time to make sure the "oralcancfoun" portion of the link appears on the Amazon page. You can get so many things online at Amazon and often much cheaper that running to the stores. In addition if you are a "Prime" customer, you can share the "Prime" advantage with several other friends or family members and can avoid shipping charges (even if they have different addresses!) on anything "Prime". My son has "Prime" which he pays a fee for each year but this allows me and several of his family and friends to share "Prime" advantage. The savings in shipping charges far outweighs the yearly cost of getting "Prime" status. Now all that money you have saved on shipping (when you didn't even have to pay for Prime because your family/friend already did - can make it a lot easier for you to donate to OCF.
And that's a good thing.