Some of the canned products you can buy a "sample can." Here is the link to the sample can for canned butter:
http://www.mredepot.com/servlet/the-90/red-feather-canned-butter/Detail

There are some more sample can's of other products on this page. I can't seem to make this second link work. You can always click on the "Canned Meats, Cheese and Butter" in the left hand column. http://www.mredepot.com/servlet/the-Canned-Meats%2C-Cheese-%26-Butter/Categories

Joy